Potassium Dichromate can be obtained through Artchemicals.com.

I will advise it is toxic, and you must avoid contact with eyes, skin, or clothing. Avoid breathing the dust, use with adequate ventilation, and wash thoroughly after handling. Always wear protective gloves (either latex, nitrile, or neoprene), goggles, and apron while handling it. If you are going to spray it, also wear a charcoal respirator. Please consult with your supplier regarding necessary precautions when handling these chemicals.

Start by mixing ½ tablespoon of Potassium Dichromate to 1 cup of hot water. This will give you a mild solution of Potassium Dichromate. You can apply it with a brush, sponge, or rag. Begin by making a test sample. Apply the solution in the direction of the grain. Wipe off the excess with a rag. To avoid lap marks, I recommend multiple thin coats as opposed to one or two heavy coats. You will be building your color in a series of thin coats. Allow to dry for 12 hours, and then rub down lightly with grade 0000 steel wool before applying a finish. This chemical process is compatible with all finishes.