Default to chumra (stringency) if it’s ambiguous, but ask a rabbi. Many shades of brown are considered tahor unless they clearly tend toward red.
According to the Mishnah (Niddah 2:6) and subsequent halachic discussions, only certain shades — primarily those resembling the colors of blood from specific sources — render a woman niddah . niddah color chart
In Jewish family purity law ( Taharat HaMishpacha ), the distinction between permissible and forbidden blood stains is both subtle and significant. At the heart of this practice lies the Niddah color chart — a tool that helps couples navigate the laws of vestot (anticipated cycles) and ketamim (stains). While the topic may seem technical, the color chart is actually a beautiful expression of halachic precision and compassion. Default to chumra (stringency) if it’s ambiguous, but
No. Halachic charts are calibrated according to Talmudic descriptions. Use one endorsed by a recognized posek or organization (e.g., the Kehati chart, Bedikat HaMishpacha chart). In Jewish family purity law ( Taharat HaMishpacha