Yup, Dave....leaving them in standing water will cause mold for sure.Had a bag (maybe .5#) go bad in very short time. Less than 2 weeks from looking perfect to major black clumps and very black spots on mesh bag. Mold, I'm fairly certain. Only ever used distilled water and never had problem before. I think I may have had a little standing water in bowl after last charge, but it was very quick and disturbing transformation.
Yep., and I had half a bag left. I did throw those out and just put new ones in the brick. Used less this time so I didn't crush let. Still have 1/4 bag left.But his beads are already paid for.....
same happened to me once.This has happened to me on a couple beads, but not as dark as some as yours. It has happened when a little piece of tobacco fell in with the beads and stayed there for some time.