I am trying to make my own black concrete acid stain. I am not a chemist other than owning a Chemcraft chemistry set when I was 10 years old.
On a SDS sheet for commercial stain it said hydrochloric acid, sodium dichromate, manganese choride and water.
I bought some "Sodium Dichromate Dihydrate 99.5%" which is red orange, Manganese (II) Chloride Anhydrous, 98+% which is pink.
I mixed 30ML of each into 1000 ml of tap water and 60 ml muratic acid 20° Baumé Hydrochloric Acid 31.5% By Weight. I was expecting black but it was deep yellow.
Can anyone help? I have 6,000 sq ft to stain and commercial stain would cost around $1000.