Physical Sciences, Chemical Sciences


Anti-Tarnishing Lacquer for Silver and Copper-based Alloys


Physical Sciences, Chemical Sciences

Focus Area:

Lacquer Coating



Social Benefits:

This one component acrylic resin lacquer is nontoxic (Lead and Cadmium free) when dry, The lacquer can be applied by spraying, brushing, or dipping and takes 10 minutes to dry. Post treatment like baking not required, The coating passes 500 hours of salt spray test (ASTM B 117) and 72 hours of flower of sulfur test (ASTM B 809),The product contains organic solvents/VOC. No liquid waste or gas emission during lacquer production.

Developing Agency:

CSIR-National Metallurgical Laboratory (NML), Jharkhand

Technology Readiness Index:

Market Launch

Website Link :
Source (more info) :

Brief Description

Description :

It prevents tarnishing (blackening) and provides a durable finish resistant to water, acid and alkali environments, The formula contains active corrosion inhibitors chemically bonded to acrylic polymer backbone, hence prevents tarnishing of copper, brass, bronze and items for long durations of several years, it can be used on silver jewellery to prevent tarnishing.

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