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Blue blue, blue brass screws

Need to Color Brass Screws Blue not Blue-White. Customer requires this color. Color must be uniform, not blotchy.

Eric Evans
Precision Stamper - Cedar Grove, New Jersey, USA
2004

You can use next solution:
sodium thiosulphate [on eBay or Amazon] 240 gm copper acetate [affil links] 25 gm
citric acid [on eBay or Amazon] 30 gm
water 1 lit
30 min, 16 °C -- according to Fishlock: Metal colouring.

Goran Budija
- Cerovski vrh Croatia
2004

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