![]() We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. It is only the type of polymer used that differentiates a permanent marker from an erasable marker.We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice. This is because fabrics don't have a smooth surface, so the ink can get soaked into its pores-staining them forever! In real permanent markers, the resin used is an acrylic polymer that functions as a "binding agent" and makes the ink stick to the surface. You might know that dry erase markers can stain other surfaces permanently, such as clothes. ![]() This is why on a very smooth non-porous surface, the ink can easily be wiped off. In a dry erase marker, the resin is an oily silicone polymer, which acts as a "release agent." It makes the ink of the marker very slippery and prevents it from sticking to the surface of the white board. In addition, a resin or polymer is added, which is the key to making the ink erasable. This is used to dissolve the color pigments that determine the color of the marker. These ingredients include a solvent, which is usually some kind of alcohol. This is possible because dry erase markers contain special chemicals as ingredients. These markers are made for non-permanent writing or drawing, which means that they can easily be erased from the white board without leaving any marks. To draw on these surfaces repeatedly, another invention had to be made: the white board pen or dry erase marker. More expensive white boards, on the other hand, are either made of enamel (porcelain-coated steel) or glass. Cheaper versions of a white board are usually laminated chipboard or melamine, which is a special type of plastic. This is why since the mid-1990s, the white board has become more and more popular. If you still have these in your school, you probably know that chalk can be really messy and creates a lot of dust. Teachers used sticks of chalk made of calcium carbonate or calcium sulfate to present their drawings or to write text for their students on a smooth and dark-colored slate of stone. ![]() Porous surfaces are able to soak up ink and even the special "release agent" will not help get them out of your clothes again!įor hundreds of years, people have used blackboards and chalk for teaching. Finally, you might have found that dry erase marker ink is not erasable on all surfaces. This is because alcohol is used as the solvent in both markers. However, when you pour rubbing alcohol on your drawings, you should have seen them both slowly dissolve. As this ingredient prevents the ink from attaching to the plate, the water can slip underneath, and as the ink is lighter than water, it can float. Again, this difference is due to the special polymer in the dry erase marker ink. There it was floating and moving as if it were alive! The permanent marker drawing should have remained stuck to the plate. You should have observed that your dry erase marker drawing magically detached from the plate and rose to the water's surface. The fun starts when you pour water on your drawing. This is because the acrylic polymer resin in the permanent marker makes it stick to the surface, while the oily silicone polymer in the dry erase marker prevents it from sticking. However, when you wipe across your drawing with your finger, only the drawing that you made with the dry erase marker will disappear. With both the permanent and dry erase marker, it actually looks like the color is sticking. This leaves the color pigment and polymer behind on the surface. When you make your drawing on the surface of a smooth plate or tray, the solvent, or alcohol, that dissolves the ink ingredients will evaporate. What Happened?ĭid you get your drawings to float? You should have-but only when using the dry erase marker. Then rinse them with warm water and soap before reusing them. Remove all remaining drawings from your plates by rubbing them with a paper towel soaked in rubbing alcohol.
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