mercurochrome; merbromin solution
A red topical antiseptic solution commonly used in Japan for minor cuts and scrapes. Often associated with school infirmaries and home medicine cabinets.
When I was a child, I had mercurochrome put on my scrapes.
Standard spelling for the topical antiseptic, combining 赤 (red) with チン (from チンキ, tincture).
From 赤 (red) + チンキ (tincture), abbreviated to チン. The name reflects the red color of the merbromin solution.