![ep-european-pharmacopoeia-color-stds.webp](https://www.hunterlab.com/media/images/ep-european-pharmacopoeia-color-st.2e16d0ba.fill-692x346.png)
EP – European Pharmacopoeia Color Stds measured
EP – European Pharmacopoeia Color is a visual liquid color scale used primarily in the pharmaceutical industry. It consists of 3 primary color standard solutions (yellow, red and blue) mixed with hydrochloric acid to make 5 standard color solutions – B (brown), BY (brownish-yellow), Y (yellow), GY (greenish-yellow) and R (red). These 5 standard color solutions are further diluted with hydrochloric acid (10 mg/l) at different concentrations to make 37 reference EP liquid color standards – 9B, 7BY, 7Y, 7GY and 7R, radiating out from distilled water at the center.