Sol322, the three solders I tried were the Wonder solder, WBT solder and the custom solder manufactured for Purist Audio Design (do not know who made it for Jim). The WBT was the brightest, the Wonder Solder in the middle and the Purist was the most neutral. I tried these solders on interconnect cables, AC connectors (Hubbell), and on phono cartridge clips (that connect to a phono cartridge). If you need to buy one of these on the open market, the Wonder Solder is the most likely candidate. The Purist Audio solder I tested does not sell as an individual product, I got the sample from Purist in order to repair an interconnect that was damaged in shipping. Hope this helps!