Liquid quickly blackens iron and steel
A
Birchwood Casey product story
Edited by the Engineeringtalk editorial team
Sep 24, 2007
The BST4 solution blackens within 30 seconds and forms a durable, black finish that can be topcoated to form an attractive, protective black oxide finish.
Presto Black BST4 brush-on liquid is a fast acting, cold blackener for all iron and nonstainless steels.
When applied to any clean ferrous metal surface, the BST4 solution blackens within 30 seconds and forms a durable, black finish that can be topcoated to form an attractive, protective black oxide finish.
In the machine shop, Presto Black BST4 liquid serves as a fast-acting blackener of re-machined areas or reworked metal parts.
It is suitable for the quick repair of scratches or damaged areas on parts previously black oxide finished.
For these applications, just degrease the surface with a cold solvent wipe (alcohol, acetone or lacquer thinner) and then apply the BST4 liquid with sponge or swab and allow it to work.
When the surface has turned sufficiently black, the liquid is rinsed off with cold water and a water displacing rust preventive oil is applied for maximum corrosion protection.
The resulting finish has a good black colour that blends well with existing black oxide finishes and will withstand the same degree of salt spray exposure as the original black oxide.
The Presto Black BST4 liquid can be applied to any type of tool steel in the tool room, inspection or main production areas.
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