Turmeric, paprika, chili powder, cumin from non-US suppliers are the #1 highest-likelihood adulteration source for lead chromate. The brightener makes the color pop. The lead is the price.
Lead chromate is a bright yellow-orange pigment that has been used in some regions as a deliberate adulterant in spices. It makes turmeric more vivid, paprika brighter, chili more saturated. It also makes the spice toxic. FDA and CDC have flagged repeat offenders. The adulteration is illegal but not consistently enforced at port.
Brightly colored bulk spice from a non-US seller is the highest-likelihood lead source in your pantry. Especially turmeric.
A paper plate, a piece of white parchment.
One bead is enough.
Green glow on the spice grains means lead pigment.
If a spice glows, throw it out. Replace with a brand that publishes third-party heavy-metal testing. McCormick, Penzeys, Burlap & Barrel publish. Spice Islands and some private-label organic brands do not.
