How would I go about making 10% hydrochloric acid? I have sodium bisulfate, sodium chloride and I can also get muriatic acid from the hardware store. I am interested in making a chromatic bleach that Tim Rudman suggests in pg. 121 of his book The Photographer's Master Printing Course. He suggests a bleach of 5% potassium dichromate and 10% hydrochloric acid diluted 1:1:6 with water. The formula looks similar to one in the Darkroom Cookbook (Formula #181 in the 3rd Edition). Thank you.