Marquis reagent — 5-IT
White · Red
5-IT
Source text (English): dark red
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.
5-it

White · Red
5-IT
Source text (English): dark red
White · Brown
5-IT
Source text (English): brown
Yellow · Brown
5-IT
Source text (English): brown
White · Brown
5-IT
Source text (English): (dark) brown
White · Red · Brown
5-IT
Source text (English): red brown
No reaction
5-IT
Source text (English): no blue color change
White · Purple · Red
5-IT
Source text (English): Bright violet red
White · Yellow
5-IT
Source text (English): yellow
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.