Gunguard Blacking Solution for Brass, Bronze and Steel

For colouring Steel Brass or Bronze to a black patina, fast acting.
We have modified the formula to a greater strength, this now allows colouring of many ferros and non ferros metals.
100ml Not available outside mainland UK
Very similar to the Birchwood casey 'Brass Black and Perma Blue' - both in reaction, speed and colour.