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Tin Plating

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I have used Stannous Chloride/Thiourea/Citric Acid formulation for immersion tin plating of PCBs with some success. However, the plating is not bright and shiny but slightly grayish. What do I need to add to the above formulation to achieve this.Or, perhaps, you can suggest a better formulation.

Best Regards,

Azhar H. Shah
Hobbyist - Karachi, Pakistan

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