Finished product. Great colors!
Combine corn starch, baking soda, corn syrup and vinegar in a medium sized bowl. It will bubble and fizz for a bit and then settle down and be ready for coloring. Add about 2T mixture to each egg container. Add food coloring drop by drop until you get the shade you like....don't be afraid to add a lot to get it dark. (we used regular food coloring drops for my son and used neon drops for my daughter) Mix WELL. Ours took 3-4 days to dry.