Marquis reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Caffeine 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.
Caffeine
caffeine · Caffeine (coffee, tea) · coffee · tea
Mecke reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Mandelin reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Liebermann reagent — Caffeine
White · Yellow
Caffeine (coffee, tea)
Source text (English): light yellow / yellow
Froehde reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Robadope reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no pink color change
Simon's reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no blue color change
Ehrlich reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Hofmann reagent — Caffeine
No reaction
Caffeine (coffee, tea)
Source text (English): no color change
Scott reagent — Caffeine
No reaction
Caffeine (coffee, tea)
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.