http://www.crayola.com/overwriters/
You must register, or log in, and you must be listed as an educator or homeschooler to request a sample. Here's what it says about them:
Quote:
Crayola OverWriters® marker colors magically appear over each other when layered. The "over" colors transform the "under" colors beneath them, so you can...
...add details to finished backgrounds,
...make lively charts and graphs,
...or create a picture story as you go!
Simply draw with the "under" colors first, then draw over them with "over" colors. The "over" colors replace the "under" colors completely - with no mixing!
OverWriters add a dynamic dimension to any project or lesson!
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