not that swibb has come up with a overly good reason to do so, h3po3 would work would it not? swibb tried it once 'cause his hcl was unaccesible at the time and got what appeared to be i2 crystals precip'ting out, but was unsure if they were in fact usable. swibb's hcl suddenly reappaeared so he didn't have a need to try the crystals that came out, but if all the tincture needs is a strong acid then is it logical to assume the i2 DID come out after all?