Marquis reagent — STS-135
White · Purple · Black
STS-135
Source text (English): violet > black
STS-135 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.
STS-135
sts-135
Mecke reagent — STS-135
White · Green
STS-135
Source text (English): dark green
Mandelin reagent — STS-135
Yellow · Brown
STS-135
Source text (English): dark brown
Liebermann reagent — STS-135
White · Black
STS-135
Source text (English): black
Froehde reagent — STS-135
White · Orange · Red
STS-135
Source text (English): orange (slow > red)
Gallic reagent — STS-135
No reaction
STS-135
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.