How to Test Ragi for Adulteration (Rhodamine B, Iron Filings, Stone Dust)

Ragi (Finger Millet) is high-risk for adulteration with artificial red dyes (like Rhodamine B) to look more "premium" and uniform, or may contain iron filings from heavy industrial grinding.

1. The Cotton Rub Test (Whole Seeds):
Rub a handful of ragi seeds with a wet cotton ball. If the cotton picks up a pink or reddish tint, artificial dye has been applied. Natural ragi color is stable and does not rub off.

2. The Magnet Test (Flour):
Spread ragi flour on a white paper. Move a strong magnet just above the surface of the flour. If tiny black particles jump to the magnet, the flour is contaminated with iron filings from the grinding stones/machinery.

3. The Water Soak (Color Bleed):
Soak a spoonful of ragi in warm water for 15 minutes. If the water turns bright pink or red immediately, suspect artificial coloring. Natural ragi color leaches very slowly and turns the water a pale brownish-pink.

4. The Grit and Sand Check:
Dissolve a spoonful of ragi flour in a glass of water. Pure ragi starch will settle slowly. If a layer of heavy sand or grit settles instantly at the bottom, it indicates poor cleaning or intentional adulteration with stone dust.