Something to add: instead of the 0.1M solution (21.4mg/ml) it almost dissolved with double the amount of solvent (-> 0.05M). Downstream, it apparently worked, at least, the HRP I was about to oxidize turned green as expected. Could it be that several sources report wrong solubility data (Acros: 80g/l; Wikipedia.de 91g/l: Sigma: 50g/l)?
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