I keep my BP in a sealed container, but I was thinking about using a desiccant just to make sure things are dry as a bone. At the moment I use anhydrous copper sulphate in an open ziploc bag in the same container but without actually mixing with the BP. Would this actually help at all? I don't see any reason why moisture would necessarily hydrate the copper sulphate rather than absorb in the BP aswell.
Because copper sulfate (if cooked to anhydrous) has a much greater affinity for water than charcoal, your primary hygroscopic component in BP, so water is selectively drawn to it. If your copper sulfate is blue, it is already water-bound and will work like shit as a dessicant. I use widely available silica dessicant packets (many sizes to choose from--they look like small pillows made of teabag material) that contain color-changing beads. When indicator beads go from orange to green, they're full of water and go into the oven for a half hour to be recycled--good as new and will last essentially forever. Be sure to blow off any BP that may have attached to packet so it doesn't burn in oven, though unlikely. Reasonably priced. Other dessicant's available. All my hygroscopic chems get dessicant--charcoal for sure (the stuff in use, post-oven drying), same with milled KNO3 and coffee-grinder ground strontium nitrate crystals. No clumping problems. Ever. Simples.
Edited by SharkWhisperer, 11 October 2020 - 01:08 PM.