Thanks Jeremy, I see your point about storing liquids. I tend to buy my chemicals in ounce or half ounce amounts, the zinc chloride I have has absorbed moisture from the air and turned to mush, there's enough to make half a gallon so thought I may aswell make it all up rather than trying to dry it as much as possible then try and guess the weights including the water in it. I'll probably get some new dry stuff and treble bag it inside a sealed jar with some silica gel in and make it up as I need it. It'll most likely be for small parts as it's reputed to black with one pass and a neutralise so it's not a life or death decision whether I make a big batch or not.
Thanks,
Nick.

Last edited by El Garro; 03/07/17 05:03 PM.

Rust never sleeps !