Click ‘Continue without accepting’ or ‘Customise Cookies’ to decline these cookies, make more detailed choices or learn more. Third parties use cookies for the purposes of displaying and measuring personalised advertisements, generating audience insights, and developing and improving products. This includes using first- and third-party cookies which store or access standard device information such as a unique identifier. If you agree, we will also use cookies to complement your shopping experience across Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. Magna Doodles have been used by teachers to help students practice writing and learn words.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. When traveling in a car on a long trip, one can draw for hours without creating lots of trash or having to sharpen pencils. The Magna Doodle is a wonderful toy that allows children (of all ages) to draw and re-draw pictures and words without wasting paper or creating chalk dust. The thickness of the liquid dispersion medium prevents them from floating to the surface, so the front side remains clean. As this is done, the magnetic eraser pulls the particles forming the lines from the front side to the back side and aligns them in the direction of the motion.
To erase the display, slide the magnetic eraser across the back of the display.
Note that the magnet pulls particles from adjacent cells and aligns them in the direction of motion (in this case, to the right).Ĭlose-up of a drawn line as seen from the front of the displayĬlose-up of the same drawn line as seen from the back of the displayīecause the particles are light and the liquid dispersion medium is thick, gravity will not pull the particles forming the lines back to the other side. Now, if you move the magnetic pen along the display, the magnet on the pen pulls the tiny particles away from the back side to the front side, forming a line. Now that we have seen the display, let's look at the pen.Ĭlose-up view of the cells from the back of the cleaned display: Note that the magnetic particles are aligned to one side (the direction of the sweep).
The middle layer is latticed so that there is always an even distribution of the magnetic particles across the entire surface of the display. white pigment - most effective (concentrations of 3 to 10 percent) and most commonly used colored pigments - in some Magna Doodles Dye is mixed in - This provides high contrast to the dark magnetic particles.magnetic oxides - black magnetite, gamma- hematite, chromium oxide, ferrite magnetic alloys - iron, cobalt, nickel The magnetic particles are dark, small and fine (about 10 microns) - This allows them to be seen easily, to stack up and to be nearly unaffected by gravity.The liquid is water, glycol or organic solvent/oil-based, and has particulate thickeners: waxes - olefinic polymer, olefinic copolymer, wax fatty acid derivatives - fatty acid amide, dextrin fatty acid ester metal soap The liquid is thick - This prevents the magnetic particles from sinking, so what you have written stays at the front of the display over time.
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