Every product we sell is made of paper (excluding plastic packaging) except for one or two supplemental items. The only product that has any kind of solvent is our whiteboard marker pen.In today’s dry erase markers, most manufacturers have shifted toward using less harsh solvents that are marketed as “low odor.”  These types of markers use denatured alcohol blends which is very similar to rubbing alcohol and still have a pronounced smell when it’s a fresh new dry erase marker that’s opened and used for the first time.The American Society for Testing and Materials (ASTM) is a US-based organization that is focused on developing and publishing voluntary international technical standards for a wide range of products and materials.There are over 12,000 ASTM voluntary standards that they have published, much of them are for industrial and commercial applications for safety purposes.Some standards have direct consumer impact like the “D-4236” standard for art materials, which includes things like dry erase markers.You can see this on the markers themselves and on their packaging.This standard basically indicates that the product has passed toxicological tests to contain “no materials in sufficient quantities to be toxic or injurious to humans, or to cause acute toxicity or chronic health problems” (example from Sanford’s Expo marker).In plain English, it’s non-toxic and safe to use as intended.If your child is coloring their tongue or eating it, well that's not it's intended use and wouldn't necessarily be safe according to the standard. These aren't wax crayons for kids and should be used with supervision.