Riboflavin (101) is vibrant yellow colour and is water soluble. It is heat and acid stable and is used in food and pharmaceuticals. Riboflavin has the additional benefit of being vitamin B2.
Stability
| Light Fastness | Fair |
| Temperature | Good |
| SO2 Resistant | Medium |
| Colour at pH | |
| pH 3 | Yellow |
| pH 5 | Yellow |
| pH 7 | Yellow |
| pH 7-9 | Yellow |