LOL, is the violence the cause of the purple bloodshed all over your workspace?? Who won?

Please do report. Perhaps the colour change would be interesting just "folded" into the mix.

Mercedes

If it stains that badly, maybe just painting it on would suffice.

Sue

I've just painted(sorta in swirls)some GV on a star that I was making from leftovers.Just gray as a backing colour.I'll report in a few days.

Rickharmer,

I missed something here. What is GV, gentian violet? Is it meant to be a colorant? It sounds like some kind of indicator used in chemical laboratories, like methyl blue or phenolthalien.

We use to put potassium permanganate into our cement mix to keep it from "blistering" inside the pipe. I think this was caused by the cast metal off-gassing when the cement was applied and pockets would form between the pipe (mold) and the cement layer. Anyway, potassium permanganate is a strong oxidizer and would stain anything, particularly your skin, a dark brown. It mixed up in water a beautiful royal purple but I did not see any color change in the cement mix.

Wow, what a tangent I took off on! Anyway, back to the present... what is GV?

David

Well,if you have a fungal infection,you're in luck!GV is a medical aid,with a byproduct of a deep blue colour.I'm trying a very small amount to colour concrete-tried grey so far,sorta blah.Will try white next.And,seriously,that fungal infection...?

No fungus on that tufa! lol
Don't try to grow mushrooms in that pot. I painted a piece with GV and it eventually washed away. It might need a sealer over it. Sure is a pretty color though. Don't try to explain to the druggist why you need the GV, just let them think you have a fungus. It's alot easier and you get less of a funny look.
How did that test piece work out for you?
Jo