Alum Blocks vs Alternatives

[LinuxHack3r]

I just read about alums blocks yesterday and am interested in giving on a try. However, we have these two products sitting in the house. I have read about the supposed differences between ammonium alum vs potassium alum. Potassium alum is natural and ammonium alum is synthetic? Should I splash either of these on my face or just order a block?

 

[Big_OC]

I currently use the Crystal and notice no difference from when I used to use and alum block I bought at an Indian grocery store.

 

[LinuxHack3r]

Just have my face a good rubbing of the Crystal and notice no unpleasantries. Note that I have not shave since last night, so I will try again when I shave again. It should be fine as an occasional astringent type item, right?

 

[martym]

I use only potassium alum on my face and pits. Works great. No complaints.

 

[Micheal Halliday]

I jsut use the Alum block from teh INdian Grocery stoer as well, and wash it off with witch hazel.

 

[VerbaVolant]

...Potassium alum is natural and ammonium alum is synthetic...

This is my understanding as well, but I am far from being a chemistry expert.
I learned from my own experience that ammonium alum does not go well on my skin. Potassium alum works wonders for me, regardless of application.

Should I splash either of these on my face or just order a block?...

First one pictured is Ammonium Alum, so I would stay away.
Second is a spray bottle that I used and it is Potassium Alum and distilled water. While I have never used it as an aftershave spray , I don't see why it wouldn't work.

One alum block dedicated for face wouldn't hurt, IMO.