NRG-4 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.

NRG-4

nrg-4

Marquis reagent — NRG-4

White · Orange

NRG-4

Source text (English): dark orange

Liebermann reagent — NRG-4

White · Orange

NRG-4

Source text (English): deep orange

Froehde reagent — NRG-4

White · Brown

NRG-4

Source text (English): brown

Ehrlich reagent — NRG-4

White · Pink

NRG-4

Source text (English): faint pink

Hofmann reagent — NRG-4

White · Yellow · Brown

NRG-4

Source text (English): light brown

Morris reagent — NRG-4

Pink · Purple

NRG-4

Source text (English): purple

Zimmermann reagent — NRG-4

White · Brown

NRG-4

Source text (English): brown

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

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