In the DK-93 formula on this site, it is stated that Kodelon was paraminophenol hemioxalate. Other sources, such as Anchell's The Darkroom Cookbook call for paraminophenol hydrochloride. Understand that I'm working at or beyond the limits of my chemistry knowledge. The formula weight of paraminophenol hydrochloride is 145.6, and it has one phenol ring. I calculate the formula weight of paraminophenol hemioxalate as 320, with two phenol rings. So we would conclude that two molecules of the hydrochloride version compares to one molecule of the oxalate version, so to convert the 5 g of paraminophenol hemioxalate to paraminophenol hydrochloride, we would multiply by (291.2/320) and get 4.6 g. I'm tempted to round that to 5 g and say the two salts are interchangeable. Does anyone know if I did that right? Thanks.