London purple

An insecticide used primarily for orchard insects. Its active ingredient was calcium arsenate, which is white but, in the early twentieth century, calcium arsenate was sometimes obtained as a byproduct of the aniline dye industry and had a purple hue.

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The pesticides--given names like London Purple or Paris Green--were arsenic base.

Vineland, NJ residents concerned about new Kil-Tone site

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