Thank you Tim for this great information and schedule - While I was waiting for an answer I did some research about the H2O2 (Hydrogen-Peroxid) grades being sold out there (internet) and I found out that at least a couple of sites are no longer selling the "food grade" H2O2, because they found out that even this grade contains "additives, stabilizers and heavy metals" that may be dangerous over a period of time. Instead they are now selling what they call a "technical grade" which according to them has NO (zero) additives of any kind - have you heard of this - if so could you comment on this!!