I have been using BM all summer with great sucess. I start with poor mans AR 16 oz,s of water, 32 oz,s of Hc1,a half lb of Sodium nitrate and 32 oz,s of CPU,s with the lids on. If I put in more than 32 Oz,s of CPU,s I remove the lids. I let this set about 12 hours then strain the solution off and delute it 4 to 1 with distilled water. Next I mix equal amounts of BM and the AR soultion in 1000 ml flasks and shake several times over a period of a few hours. I poor the mixture in to fullmer separtor funells and after it settles out draim off the AR solution and then the BM. When I have 2000 ml of BM that has turned dark yellow/amber I wash it with a 4 to 1 mixture of HC1 and distilled water while heated to just below boiling. I separate the liquids again and them add 2000 ml of distilled water and 4 oz,s of oxcalic acid and heat to simmering while stirring. The gold drops out as fine grains and brown mud. I wash this with hot HC1 and then distilled water. Result is 99.999 pure. I have processed over 12 oz,s this way and have sent five to Midwest for 95 percent of spot. Since I have over 200 lbs of ceramic CPU,s to process and I am, 78 years old I am teaching the process to my daughter just in case.
Bob
