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Thanks. You've been very helpful. By weight it is then.

I recently bought some ws-23 in powder. I'm doubting on how to mic it with pg... I want to do a 30% solution but, how do I do it? By weight/weight? By weight/volume? I mean, that I want to mix some solution I could put 30 grams of ws37 and 70 grams of PG. That would be a real 30% solution by...