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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 [affil link]
240 gm copper acetate [affil link] 25 gm
citric acid
⇦ on
eBay
or
Amazon [affil link] 30 gm
water 1 lit
30 min, 16 °C -- according to Fishlock:
Metal colouring.
Goran Budija
- Cerovski vrh Croatia
2004
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