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).
The chart is a reference of standardized colors, traditionally ranging from deep red to pale yellow or beige. It allows a woman (or a posek, halachic authority) to determine whether a stain found on a bedikah cloth (examination cloth), undergarment, or other surface is tamei (ritually impure) or tahor (ritually pure). 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. The chart is a reference of standardized colors,