Ehrlich reagent — Tryptophan
White · Red
Tryptophan
Source text (English): red / purple
Tryptophan reagent analysis
There are more substances than colors, so to increase analysis precision use a kit with multiple reagents. Exact color of a reaction depends on adulteration, quantity, lighting, temperature, exposure to air, storage, as well as reagent quality and degradation. Positive or negative result does not indicate if a substance is safe. No substance is 100% safe.
Tryptophan
tryptophan
Hofmann reagent — Tryptophan
White · Yellow · Green
Tryptophan
Source text (English): yellow > green
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.