Pyrogallol Tech Grade 99%. Pyrogallol Tech Grade 99% Synonyms:Pyrogallic Acid; 1,2,3-Trihydroxybenzene; 1, ... resistant containerShelf life:12 months in unopened container. 100kg Pyrogallol Tech Grade 99%, Pyrogallic Acid, 1,2,3-Trihydroxybenzene; 1,2 ...