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I have a bottle of Noodler's black that I sometimes dump other inks(mostly other black inks) into from converters and such when I change inks. Inks like Parker Quink, Noodler's red black, Pelican black, etc. This black ink has developed a strange but pleasant floral smell. I'll call this black, floral black. I've used this ink for a few years like this with no problems. No mold, sludge, discoloration or anything besides the floral smell. It's a very well behaved ink. Recently I've been dumping off blue-red inks into a small amount of distilled water from ink changes. The inks have been Noodler's Navajo Turquoise and Plains of Abraham, Namiki Blue, Sheaffer turquoise and red, generic magenta printer ink, and PR plum. At first, it also developed the same floral smell as floral black but lately it had also developed a strong corn smell. Like the smell you get from opening a fresh can of corn along with the original floral smell. The smell is far too pungent though, unlike floral black. This I'll call corny blue also no problems with mold, sludge, sediment etc. I haven't inked a pen with it and I don't know if I should. Neither corny blue or floral black have have any trace of "mold-like" smells. Just incase it was mold I added a small amount of benzalkonium chloride to each but it smells the same. I'm thinking it might be a chemical reaction instead of something biological. Does anyone know why these might be like this? Should I just throw away corny blue?