Black - semi-gloss (for Cast Bronze and Brass) Color develops gradually and remove after 15 min. When a reddish-purple color is attained from 10 to 30 min. A reddish orange color begins after 2-3 min. Red-Purple Satin (for Cast Bronze and Brass) Remove after 5 min., wash in warm water and air dry. Immerse in hot solution (140-158☏, 60-70☌) which etches surface. Dull Pink (for Copper & amp Copper Plate) Important note: In general, chemically induced finishes are unsuitable for use on articles to be used with food.Ģ1. Remove to hot water while ammonium chloride is added to the cupric sulfate solution. Immerse in boiling cupric sulfate solution about 15 min. Red - semi-matt (for Copper & amp Copper Plate) Variations of this formula add a pinch of Sulfurated Potash, Ferric Nitrate, or Cupric Nitrate for a slight coloring effect.Ģ0. KOSHER salt with no additives is available at most markets and will work for this. 5 parts - DO NOT USE TABLE SALT - If you use table salt you will not achieve the desired affect as IODIZED salt has iodine in it. Then dip into diluted (1 acid:8 water) Nitric acid for 1/2 hour, remove, wash and dry. Not sure why they specified grains, so I wrote the conversions in grams as well.īrush to surface for color.May produce a grey blue when tap water is used. A preservative such as paste wax or polyurethane is necessary. Additional applications and chemical action turn the metal light green.Ī transparent, dip process patina. Early stages of this recipe produce purple. Temperature at 170 to 190☏, a hot process especially for brass. (Trial and error for certain levels)Ī cold process that is said to work well on brass For deeper green add 16 units of cupric sulfate.
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