Marquis reagent — 4-MeO-PVP
White · Brown
4-MeO-PVP
Source text (English): brownish
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.
4-meo-pvp

White · Brown
4-MeO-PVP
Source text (English): brownish
White · Green · Brown
4-MeO-PVP
Source text (English): olive
Yellow · Brown · Green
4-MeO-PVP
Source text (English): olive
White · Brown
4-MeO-PVP
Source text (English): light brown
White · Green · Brown
4-MeO-PVP
Source text (English): olive
White · Yellow
4-MeO-PVP
Source text (English): yellow
No reaction
4-MeO-PVP
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.