Marquis reagent — Gramine
White · Brown
Gramine
Source text (English): faint brown
Gramine 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.
Gramine
gramine
Mecke reagent — Gramine
White · Black
Gramine
Source text (English): blue > black
Mandelin reagent — Gramine
Yellow · Black
Gramine
Source text (English): brown > black
Simon's reagent — Gramine
No reaction
Gramine
Source text (English): no blue color change
Ehrlich reagent — Gramine
No reaction
Gramine
Source text (English): no color change > light pink
Hofmann reagent — Gramine
White · Orange
Gramine
Source text (English): light orange
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.