Light and Dark
This page contains worksheets, online activities
Last Updated: 4th October 2006
First School Years
25+ Light Activities for Learning All About Light and Dark, Day and Night
Inside: A fun collection of light activities for exploring light, with accompanying picture book suggestions to use in your investigation.
Today we’re sharing a super cool list of light activities for use in your next learning investigation. From fireflies to the sun and moon, torch play to glow sticks, we’ve got activity suggestions for exploring all different sources of light. They are perfect for teachers, educators and parents who would like to incorporate this fun, learning theme into their centres, classrooms and homes.
25+ Light Activities for Learning
1. Book Inspired Brainstorm: Eric Carle’s The Very Lonely Firefly is actually a great starting point for this theme as the firefly finds different sources of light while looking for it’s friends. Before reading the book start out by brainstorming a list of as many different sources of light that the children can think of?
2. Firefly Drawing: My class of 5 year olds recently made fantastic firefly pictures by cutting a small piece of shiny paper for the body of the firefly and drawing on the rest of its body and decorating the night sky black background. I was surprised at how effective regular coloured pencils looked on black paper.
Day & Night: Light Activities Exploring the Sun, Moon & Stars
Continue your exploration of light with those most marvellous lights in our sky – the sun, moon and stars! Here are some fun ways to explore their wonder together…
3. Day and Night Around the World: Introduce day and night around the world with this simple demonstration from Learn Play Imagine. You’ll just need a globe and a torch.
4. Rainbow Filters: Explore colour filters with light from the sun with this simple Kandinsky inspired art project.
5. Catch the Sun: Make Cosmic Sun Catchers with Babble Dabble Do.
6. DIY Kaleidoscopes: Or try making these mini kaleidoscopes with a twist! (Via Babble Dabble Do)
7. Shadow Shapes: Children are fascinated by their shadow and their are lots of cool activities that you can do related to making shadows! Children can work in pairs or small groups to make super cool body shapes and then tracing the shadows with chalk (via Tinkerlab).
8. Shadow Drawing: Or, on a smaller scale, this Lego Shadow Drawing from Handmade Kids Art could be adapted to use all sorts of toys or natural materials to make interesting shadow drawings.
9. Shadow Puppets: Try making your own shadow puppets and these magical, stained glass puppet show backdrops (via Creative Play Central).
10. Colored Shadows: For the ultimate WOW! moment, why not make coloured shadows with this tutorial from Inner Child Fun.
11. Book Link: Looking for a shadow book to explore together? Check out The Shapes of Me and Other Stuff by Dr Seuss.
12. Pizza Box Oven: If it is warm and sunny where you are, test the warmth of the sun with a pizza box oven (this one via I Can Teach My Child).
13. Sun Melting Experiment: You can also test what melts in the sun (via Frugal Fun 4 Boys).
14. Sun Melted Rainbow Crayons: Or try recycling your broken crayons by making sun melted crayons (via No Time for Flashcards).
15. Star Search: Be inspired to catch a star by reading the awesome How To Catch a Star by Oliver Jeffers and then make your own star shaped Cheese Puffs for morning or afternoon tea.
16. Starry Night Creations: There are so many children’s art ideas inspired by Van Gogh’s Starry Night but these Starry Night Playdough Creations (via Early Years Down Under on Facebook) are my absolute favourite. You can also see their fabulous group collage here.
17. Book link: Support your child’s interest in Van Gogh’s famous painting with the book, Katie and the Starry Night by James Mayhew.
18. Fun By Torchlight: A fun way to revise reading sight words or spelling words is to make the room dark and hide the words (written on cards) all around the room. Then armed with torches, the children can go searching and exploring, reading the words as they shine the torch on them. Find out more at A Little Learning for Two.
19. Book Link: Read Flashlight by Lizi Boyd and be inspired to make some pencil on black paper pictures of what you might see on a walk in the dark.
20. Disco Discovery Bottles: Design your own disco discovery bottles via Babble Dabble Do.
21. Glow Alphabet: Make letters from glow sticks and use them to play a letter recognition game, or to form spelling words (via Creekside Learning).
22. DIY Lanterns: There are lots of ideas for making lanterns – you could try these gorgeous tissue paper covered jars (via Picklebums)
23. Recycled Bottle Lanterns: Or these simple to decorate lanterns from recycled bottles (Go Explore Nature).
24. Fairy Garden: Battery operated tea lights are much safer for projects with children. I love how My Small Potatoes has used them to create this gorgeous Fairy Garden Small World in a basket.
25. Just for Fun: Add a little magic to your classroom by decorating it with fairy lights for the week. You could even create a cosy book reading corner from a tent or large cardboard box. Check out this post from Lessons Learnt Journal for inspiration.
26: Book Link: You could also use the brightly lit toyhouse in children’s classic, Goodnight Moon by Margaret Wise Brown, as inspiration to create your own lighted dollhouses with fairy lights (via The Artful Parent).
Do you have any light activities your children love?
Lauren Hunt is an Early Childhood Teacher who currently works part time teaching children in their first year of school. She is also mum to a two year old daughter. Lauren is passionate about play-based, hands-on learning and is certainly kept busy by her energetic toddler!
Printer prints light or dark paper
I think that many who use laser printers have encountered such a problem that their device starts printing text that is too light, or vice versa, black lines appear on sheets of paper. Perhaps you even now have a similar problem. Therefore, today’s article will be devoted to the quality of printing laser printers.
It should always be understood that after the purchase of the printer some time will pass and it will start to print not as well as before. And over time, various “bands” may generally begin to appear. It does not depend on the brand of the device and its high cost. Sooner or later this happens.
The whole catch lies in such a detail as the cartridge. It is not durable, its resource is limited. It may run out of toner, or it may simply become clogged. But you should not immediately reject your printer and take it to a service center for repair, or buy a new cartridge for it (which, by the way, costs as much as a third of the printer). Many of the problems can be fixed on your own without spending a lot of money. What will be discussed next.
Failed to save printer settings error 0x000006d9
How to print a page from a website?
Basic principles of printer operation
In order for you to better understand and understand how elementary everything is and how simple the principle of operation of the printer is, I suggest that you familiarize yourself with its design. And then we will learn the main components of a laser cartridge.
There are only three main parts in the printer. And of course, we will not have to disassemble the printer as much as it is shown in the video, everything will be much simpler. 🙂
The main components of the cartridge
Photoreceptor , or in another way the photo drum. We can say that this is the main detail, such a heart of our cartridge. After all, the quality of the entire print, the presence or absence of various defects (streaks, etc.), directly depend on this part and the state in which it is located. The presence of various defects on its surface, all sorts of dents and scratches, can significantly reduce the quality of the entire print. How it works was described in sufficient detail and shown in the video.
It is also necessary to know here that the service life of the photoreceptor can be significantly reduced if the quality of the paper is poor, the toner is not suitable, moisture and other foreign objects enter. Quite often, printer users themselves reduce the resource of this part, not paying attention to the ingress of foreign objects into the printer, such as paper clips. Therefore, if you want the photo drum to serve as long as possible (and its resource is approximately equal to 12,000 pages), then try to avoid getting debris into the working part of your device.
Squeegee — is a plate made of metal with a polyurethane tip. The task that this part performs is simple — it removes excess toner from the photoreceptor that remains after printing on paper. Simply put, it performs the function of a scraper.
But no matter how simple its purpose is, it is one of those critical parts, the serviceability of which significantly affects the quality of the print. After all, if any damage appears on its polyurethane blade, or it does not clean the photo drum well enough, then various defects immediately appear during printing. In addition, a damaged squeegee reduces the life of the drum interacting with it.
Another feature is that the squeegee and the photoreceptor are considered an inseparable pair of parts. If one of them fails, then you will have to replace two elements at once.
Magnetic shaft is the shaft itself, made of metal, in the middle of which there is a magnetic core.
The surface condition of this part can also influence the print and its quality. After all, he transfers the toner from the hopper to the drum using current.
Corotron is a metal rubberized roller, it is also called a charge roller.
Like other parts, during printing, it may introduce certain defects on the page. In many ways, it depends on the cartridge model. Indeed, in different cartridges, it can perform slightly different functions. Among them may be cleaning the photoreceptor from paper dust, discharging the drum, and most often charging the photo drum with a positive charge.
This part does not wear much compared to the previous ones. In order to avoid printing defects associated with it, it is recommended to clean the surface of the corotron from toner and paper dust from time to time. If this video is dirty, one or two lines of text may be duplicated throughout the entire page. Although the reasons for this may be in another part of the printer.
Doctor blade — somewhat similar to a squeegee, but it has a slightly different purpose. It distributes the toner evenly over the magnetic roller and removes the excess back to the hopper.
It also affects the quality of the print. However, cases of blade wear are much less common. I advise you to clean its surface every time you refill the cartridge. What is also recommended for other parts of the cartridge.
Getting rid of print defects
This article only talks about the causes of various defects during printing and how to fix them. In this regard, the process of refilling the cartridge and cleaning its parts will not be considered here. Separate articles on this site are devoted to this. Yes, and these operations are not complicated, anyone can handle them, observing some caution so as not to get dirty up to the very ears in the toner. First of all, we will determine the causes of malfunctions by the appearance of the printed page. Indeed, for almost any characteristic deterioration in the quality of printed pages, we can talk about a particular problem in the printer. The quality of the print result can be greatly affected by the condition and type of toner. It often loses its properties being, for example, in a damp room. But first things first. Let’s look at the most typical printing defects.
Light streak, running the length of the page
I think everyone has experienced this. This is a sign that the toner hopper is low. Therefore, it is best to refill the cartridge as soon as possible.
If you can’t refill the cartridge, but you need to print something urgently, you can remove it and give it a little shake, then put it back in the printer. This will make it possible to print without a light strip for some time. But, keep in mind that this action can reduce the life of the photo drum. The toner begins to be unevenly distributed over its surface, which leads to wear. In the same way, the drum is affected by printing, if nothing is done and such an effect is ignored.
Black streak on either side of the sheet of paper, or even on both sides
This may indicate wear on the photoreceptor. It is necessary to replace it together with the squeegee. It is highly recommended, in addition, to completely clean the toner cartridge, and then refill it.
As you can see, after such an operation on the cartridge, there are no more streaks.
Pale, very bleached sheets
There can be various reasons, the most common are:
- defective squeegee drum, they must be replaced;
- poor, or toner that does not fit this cartridge;
- malfunctions related to the blade that dispenses the toner, or the sheath on the magnetic roller, these parts also need to be replaced;
- weak contact with the magnetic roller.
In the case shown in the screenshot, the malfunction was associated with severe wear of the photo drum. When it was replaced, along with the squeegee, the quality immediately became normal.
Duplicate text (or any other image) throughout the entire page
Two main reasons:
- charge roller dirty, it needs to be replaced with a new one;
- weak corotron contact.
In this example, we found that this roller was too dirty.
Dark, transverse streaks, at regular intervals
This is very common right after refueling. Perhaps the reason is the weak contact of the magnetic roller with the cartridge cover. Or perhaps the cartridge is simply not closed properly, or the old toner needs to be cleaned.
- The magnetic roller does not make good contact with the cap on the cartridge;
- the shaft itself is faulty.
In our case, the cause of such a print defect was poor contact between the shaft and the cover.
Short streaks and dots all over the page
This happens when toner starts to bleed onto the paper. He can even wake up completely on the whole sheet. Here, as always, the culprit can be a squeegee with a photo drum, namely their wear. The cause may be that the waste toner box is overflowing.
Possible actions to get rid of this:
- clean the waste toner box;
- replace blade and drum;
- Try refilling the cartridge.
In the above example, the defect was eliminated by replacing the squeegee with a photo drum.
Longitudinal stripes are printed all over the sheet
This is one of the most common problems. Causes may include:
- the toner box is full;
- squeegee wear.
In our case, everything was cured by cleaning the hopper.
Dark, elongated spots
This is often due to uneven toner coverage on the magnetic roller. The toner may not be suitable for this type of cartridge. And perhaps the shell of the magnetic roller itself, or the blade for dispensing the toner, has worn out. We replaced both of these elements and this defect disappeared without a trace.
Often, among the causes of unsatisfactory printing, there are worn bushings on the magnetic roller. These are such bearings:
They maintain a given gap between the photoreceptor and the magnetic shaft. Over time, during operation, wear of these parts occurs, which reduces the gap and negatively affects print quality.
Sometimes, during cartridge refilling, these bearings are lost, sometimes they crack and break. This always leads to various negative effects on printing that show up on paper. Look at the image of the printed sheet: along the entire right edge there are black stripes of different lengths. After the cartridge was disassembled, it turned out that such a bearing had cracked at one of the ends of the magnetic shaft. When it was replaced, the stripes disappeared.
Well, that’s all the main problems that you may encounter when working with laser printers. As you can see, even the slightest malfunction in the cartridge leads to the manifestation of various printing defects on a sheet of paper. And most importantly, keep your equipment clean and tidy. That’s all. Good luck!
This might come in handy:
Why does the printer print black sheets
- Light on photoconductor
- Incorrect paper type
- Cartridge leak
- Contact problems
- Missing corotron (charge roller)
- Damaged high voltage unit 900 82
Flashes on the photoconductor
The printer’s lasers apply an invisible image that completely repeats the image sent from the computer for printing. The imaging drum is very susceptible to excess light. In those places where under the action of light the charge will change to the opposite charge of the toner, the dye will adhere in the same way as to areas with an invisible pattern applied. As a result, black spots will be visible on the finished document in the “highlighted” areas.
The photoconductor can be illuminated by disassembling and even replacing the cartridge in a well-lit room.
All actions with it must be performed in complete darkness, after refueling, the photoconductor must be quickly wrapped in paper, otherwise you will have to change the shaft for a new one.
The cost of a new part is 5-7 USD. You can also wait until the photosensitive layer recovers on its own.
Wrong paper type
If the printer prints in black, the cause may be the wrong paper selection. It is paper that you need to suspect if you bought it recently and have not used such sheets before. Sometimes the wrong paper causes fires inside the printer. This is especially true for fax paper in laser printers, under the influence of high temperature, such sheets turn black.
After refilling, small black defects may immediately appear during printing, which is normal.
To eliminate them, just print a few more sheets. Black marks appear if the toner gets on various parts during refilling, and the refiller is too lazy to remove the powder.
If more than one document has already been printed, but the printer still prints black sheets, this may indicate a cartridge leak. The situation will be corrected by its disassembly, reassembly and proper installation.
Heavy use of the printer will quickly cause the contacts on the cartridge to become dirty and wear out.
The contacts of the power supply can become dirty, and the spring contacts begin to get stuck and clog inward over time. Due to improper operation and too sharp pulling of the cartridge, they turn out by 30-40 °.
Before replacing a part, you can try cleaning the contacts with a dry rag or a paper eraser. In order not to worsen the state of printing equipment, all actions must be performed carefully.
No corotron (charge roller)
When the cartridge is refilled, the corotron is removed, after refilling it may be forgotten to return to its place. The printer is producing black paper and have you recently refilled the toner? Then check for corona. Replace if necessary.
Breakdown of the high-voltage unit
A black background on the entire sheet may indicate the failure of the device itself. The cause of black printing is often a malfunction of the high voltage unit. Repair such malfunctions only in the service center.