New Dain Silver S1 (NDS-S1) is an eco-friendly, chromium-free, neutral aqueous anti-tarnishing solution for silver and silver alloy surfaces, suitable for decorative and electronic parts. It prevents tarnishing without impairing electric contact resistance, solderability, or surface appearance, and is free from regulated hazardous substances. Treatment involves immersion in a 10% diluted solution at 50°C (pH 5-10) for over 10 seconds, followed by rinsing and warm air drying. Performance tests, including (NH4)2Sx immersion and 2-month storage, confirm superior anti-tarnishing efficacy.