I was recently cleaning out oft-unused items from my cupboards and ran across a great quantity of the liquid food coloring commonly available in grocery stores. I had 4 boxes of the 4 colors each, and 2-3 of the larger dark brown glass (1oz?) bottles of green food coloring. I threw it all out, but it got me to wondering why ONLY green food coloring is available in such large volumes. Wouldn't you expect yellow or red, as they generally require more to get effective tint?