Re: how to to make natural alum to be in cube like and soft in like a soap

I'm not sure exactly what Alum is but I assume it is some form of natural aluminium salt, probably the sulphate or hydroxide, or a mixture of both. Aluminium salts of all types have been used for deodorants for a long time so I guess it's no suprise it has that effect when applied to the underarm.

As for making a solid stick or cube, I'm not exactly sure what you could add to the raw alum but I looked up a couple of commercial preparations of solid deodorants, just to see what they use to "solidify" their active ingredient.

Most used gycols such as butyl or propyl gycol and then a whole buch of commercial thickeners as well.

One complete ingredient list I found was from a patent for a deodorant, they had the following receipe for a solid stick.

EXAMPLE 5 (Deodorant stick)

• 32.0 parts of groundnut fat
• 9.0 parts of anti-sedimentation agent
• 20.0 parts of castor oil
• 10.0. parts of isopropyl palmitate
• 2.0 parts of carnauba wax
• 5.0 parts of lanoline
• 3.0 parts of beeswax
• 3.0 parts of solid skin-tolerated spreading agent
• 8.0 parts of hard paraffin
• 1.0 parts of antioxidant
• 6.0 parts of deodorant substance
• 1.0 parts of perfume oil

Well, I hope that gives you some clues about how to try and make your alum in a useful form.