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topic 0451

Stripping Gold


I am looking for a mild solution to strip gold. There used to be a product called "Orostrip" which was sold in a dry form and upon dissolving in water adding cyanide, it worked very nicely to strip gold layers from semiconductors without damaging the substrate.

Does anyone know where to get it or how to prepare this ?

Gerko Oskam
university - Baltimore, Maryland

"ORO : as a prefix with various endings, gold plating solutions, chemicals, and supplies, Technic from the Metal Finishing Guidebook Tradenames section.

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania

A straight KCN solution heated will strip Au from substrates. The Orostrip from Technic has an accelerator for KCN solutions.

Another thin film supply house on the East coast had a similar product but I forget the name of the company (it has been years since I've dealt w/ this).

Another way to strip Au is to use a heated solution of KI:I:H20. This chews Au quickly but is very corrosive to many metals (and you can see the Iodine fumes rise off the heated surface).

Jeff Albom
- El Granada, California


Every gold process supplier sells a gold stripper. If you put it on chances are you'll occasionally have to take it off too!

I have used LeaRonal Super Strip 100 for years, but the Orostrip works good too.

Most of the strippers are based on a solution of sodium or potassium cyanide and an organic oxidizer like meta-nitro benzoic acid.

bill vins
Bill Vins
microwave & cable assemblies
Mesa (what a place-a), Arizona 


Enthone-Omi has a product named Circuitprep NX to which you have to add KCN.

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel

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