Alum solid blocks

Don't know, but this is what I use, <£3
mEvbo8txJ_JyGtk8-8YejIw.jpg

https://www.ebay.co.uk/itm/60g-Natu...spirant-Hot-/112481235565?hash=item1a3067726d
 
These ones from Connaught are Excellent.

I think they are cut from crystals ? Maybe ?

 
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