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Hot blueing formula reuseable?

i found a formula for hot blueing : ammonium nitrate , caustic soda ⇦liquid caustic soda in bulk on Amazon [affil link] and sodium nitrite . This formula has her instructions to follow. but my question is :
is this formula re-useable ?
what time along?

CARLOS CASTELLANOS
eng. - GUADALAJARA, JALISCO, MEXICO
2003

The Short Answer is Yes

Dave Hardwick
- Hamilton, New Zealand
January 2, 2009

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