Quote Originally Posted by geyes30 View Post
Hi Ian,

Thanks for your response. My follow-up question is, Why is the hardening agent not of the more common potassium/sodium alum form (i.e. potassium/sodium aluminium sulfate)? Do the components listed allow the formation of the more common alum form in the solution?
Alum is Potassium Aluminum Sulfate.


The hardening action of Alum is reversible.