I made a batch of FWFL several years ago. Really liked it, but most of my high volume boolits get the JPW/LLA treatment, so it has lasted me a long time. Recently cast up a bunch of .38 wadcutters and used the last of it. So I got out my fixin's and made up a full pound batch. I only had black carnauba wax off a cheese wheel and it turned the lube an unpleasant "off" color. Certainly functional, but ugly. So today I melted it back down and threw in a green Texas Roadhouse crayon. Not much change, so I added a second... and then a third. That looked right so I let it cool.
I just turned it out of the foil loaf pan I melted it in. Not sure what those roadhouse crayons were, but this is what I have...