Recipe
- Dissolve 20g of tannic acid in 30ml of 60% ethanol
- Dissolve 36g of aluminum chloride (hydrated) to the solution from step 1
- Dissolve 20g of ZnCl2 in the solution from step 2
- Dissolve 3g of rosaniline HCl in the solution from step 3
- q.s. to 70ml with 60% ethanol
