noun
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.
子供のころ、擦り傷に赤チンを塗ってもらった。
When I was a child, I had mercurochrome put on my scrapes.
Iodine tincture, another topical antiseptic, but brownish in color and more irritating to wounds compared to the milder red mercurochrome.
From 赤 (red) + チンキ (tincture), abbreviated to チン. The name reflects the red color of the merbromin solution.