As mentioned previously, the alcohol is used primarily for cleaning the surfaces.
So, almost any type will do that as long as it does not contain any other ingredient.
Take a look at the several "Cold Toner Transfer" videos posted on YouTube.
Explanations are given.
Roland F. Harriston P.D.
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I buy 99% isopropyl alcohol in pints for about $1.50 at pharmacies like Walgreens, CVS, etc. You have to ask the pharmacist for it.