[YetAnotherNick]

It's below the turmeric whole test, and is more or less the same test.

[hackerlight]

That's described as a test for "artificial colour"

[Inhibit]

The lead is used to adulterate the product for color if I'm recalling correctly.

[jaggederest]

Lead chromate is an incredibly vivid yellow. Good color, bad health effects, as we learned from years of lead paint.