Marquis reagent — Lidocaine
No reaction
Lidocaine
Source text (English): fizzes clear
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.
lidocaine

No reaction
Lidocaine
Source text (English): fizzes clear
White · Yellow
Lidocaine
Source text (English): yellow
Yellow · Brown
Lidocaine
Source text (English): brown
White · Red
Lidocaine
Source text (English): red
No reaction
Lidocaine
Source text (English): no color change
No reaction
Lidocaine
Source text (English): no blue color change
No reaction
Lidocaine
Source text (English): no color change
No reaction
Lidocaine
Source text (English): no color change
Pink · Blue
Lidocaine
Source text (English): blue
Pink · Blue
Lidocaine
Source text (English): blue precipitate


Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.