Marquis reagent — 4F-NPP
No reaction
4F-NPP
Source text (English): no color change
4F-NPP 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.
4F-NPP
4f-npp
Mecke reagent — 4F-NPP
No reaction
4F-NPP
Source text (English): no color change
Mandelin reagent — 4F-NPP
Yellow · Brown
4F-NPP
Source text (English): brownish (light)
Liebermann reagent — 4F-NPP
White · Yellow
4F-NPP
Source text (English): yellowish
Froehde reagent — 4F-NPP
No reaction
4F-NPP
Source text (English): no color change
Gallic reagent — 4F-NPP
No reaction
4F-NPP
Source text (English): no color change
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.