Raw Alum (Potassium Aluminum Sulfate) Crystals 200g I mistakenly bought crystals when I needed powder, so I'm selling them. Due to thickness, it's 100g x 2 packs! Tare weight is subtracted. - For preventing discoloration of pickles, removing bitterness, and preventing food from breaking down during cooking - For deodorizing and cleaning [How to Make Alum Spray] (1) Put 15g of raw alum and 500cc of water in a bottle and shake well to mix. (2) Let it sit until the alum dissolves in the water and becomes clear. (3) Spray on areas where you are concerned about odors. This alum can be used for a wide range of purposes, from pickling to laundry and deodorizing.