Ken, you gotta be careful with online purchases of that stuff. The colors and hues everyone might be after, need to be seen in-person as well as the mil thickness. Another issue with the gel papers are the quality. Lastly, because of the sheer number of hues available, one or two numbers off, and you'll be stepping into the pinks or oranges with a red sheet or amber and when applied to a different light source than what's in the store, you may get undesired results in front of a halogen or incandescent light source than what you originally guessed. It's always best to get a few different sheets on either side of you desired choice to "test the waters" of your different applications to get the EXACT color you desire. Trust me, this comes from years of utilizing gel papers to change light colors (back in the day). One other issue is that one manufacturers "true blue" or "true red" isn't always the same as the next guy's...