First preparation: Coaltar Saponin 6g and salicylic acid 3g in Eucerine Aqua AD 100g and second preparation: Salicylic acid 2g, propylene glycol 20g water ad 200g

Preparation 1

You can read the solution in question ' I would like to have received some advice on the following preparation: ' and ' We received the following recipe ': adsorbing on starch and evaporating alcohol can be sufficient.

Preparation 2

You could increase the amount of PG here but then it becomes probably sticky; I would start by adding 20g of alcohol to the 20g PG and dissolve in this mixture salicylic acid. Then gradually dilute with water and see if there is a precipitation. If yes + 10 ml of alcohol and then water again, look for precipitation; If yes + 10ml alcohol + water and so up to 200ml