Marquis reagent — EPT
White · Brown
EPT Fumarate
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.
ept · EPT Fumarate

White · Brown
EPT Fumarate
Source text (English): brownish
White · Black
EPT Fumarate
Source text (English): weak grey/black
Yellow · Brown
EPT Fumarate
Source text (English): brown
White · Brown
EPT Fumarate
Source text (English): brown
White · Yellow
EPT Fumarate
Source text (English): faint yellow
No reaction
EPT Fumarate
Source text (English): no pink color change
No reaction
EPT Fumarate
Source text (English): no blue color change
White · Pink · Purple
EPT Fumarate
Source text (English): pink/purple
White · Yellow
EPT Fumarate
Source text (English): yellow
Pink · Blue
EPT Fumarate
Source text (English): blue spots
White · Yellow
EPT Fumarate
Source text (English): yellow
Colour swatches are illustrative, not measured colour values or reaction timing. Original reference observations are preserved below each result.