FRETS.COM
Shop Tip #062
© Frank Ford 2004; Photo by FF

I often use powdered artist pigments to color glue. I keep my colors in these little wells I drilled in a big block of plastic. The holes are 3/4" diameter and about an inch and a half deep. In this container, all the colors are handy for immediate use, and when I run out of a color I refill it from the bottle it came in.