Grog Buff Proof Ink Black is an extra-permanent kind of ink, definitely the best on market.
Launched in 2004 with black only, Grog was created to meet handstyle requirements.
Grog Buff Proof Ink is resistant to many chemical agents without bleaching, keeping its total black look. Neither rain nor sun nor any other atmospheric agent can attack it.
Grog Buff Proof Ink is handy and is compact enough to be kept in a pocket. The bottle is impact resistant.
Available in 250 ml bottles.