Oh boy, it never ends. The dark cs indicates
larger particles which means less bioavailablity. Settle it in your heart that clear is best and it WORKS. The darker stuff can work too but not as well. Mesosilver is the company that puts out this stuff about true colloidal not being clear. I don't believe it because I and many many others know the clear cs from both the Silvergen and the Silverpuppy works great. Marketing B.S.