Sodium Hydroxide 1lb.

The Compleat Sculptor, Inc Verified independent store

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For Brown To Black (Semi-opaque finish; Hot or cold process): Antimony Sulfide (2 parts/weight) Sodium Hydroxide or Caustic Soda - lye (4 parts/weight) Clean, potable water (256 pa rts/weight)Note: Works well on 85/3/5 bronze but turns black on silica bronze. Show more