🧊 Alum Rock – 227g & 453g | Pure Potassium Alum Crystals for DIY Skincare & Deodorants. 🧴 Perfect for making your own deodorant sticks, aftershave blocks, facial toners, foot soaks, and more, These versatile crystals can be used whole or ground into a fine powder, dissolving easily into water-based formulas or rubbed directly onto the skin when in block form.