Blue came from the indigo plant, and red from madder root or cochineal beetles.
From the post-gazette.com
This insect is in the same family as the insect from which cochineal is obtained.
From the en.wikipedia.org
Cochineal dye was used by the Aztec and Maya peoples of Central and North America.
From the en.wikipedia.org
The Polish cochineal extract's natural carminic acid content is approximately 20%.
From the en.wikipedia.org
Instead carmine or cochineal has been used with a natural raspberry flavour.
From the nzherald.co.nz
Other colors were achieved using cochineal, vermilion, arsenic, and sulphur.
From the en.wikipedia.org
Organic chemistry delivered the final blow for the cochineal color industry.
From the en.wikipedia.org
The pigment is also called cochineal after the insect from which it is made.
From the en.wikipedia.org
Cochineal is one of the few water-soluble colorants that resist degradation with time.
From the en.wikipedia.org
More examples
A red dyestuff consisting of dried bodies of female cochineal insects
Cochineal insect: Mexican red scale insect that feeds on cacti; the source of a red dye
The Cochineal (Dactylopius coccus) is a scale insect in the suborder Sternorrhyncha, from which the crimson-coloured dye carmine is derived. ...
A species of insect (Dactylopius coccus); A vivid red dye made from the bodies of cochineal insects
(English) A bright red dye produced from an insect-parasite of the nopal (prickly-pear) cactus. Cochineal was cultivated in pre-Hispanic times, and after the conquest, it was a valued item traded with Europe.
A scarlet dye made from the insect Coccus cacti, native to Mexico and Central America.
A scale insect that lives on prickly pear cactus. Female cochineal are full of red carminic acid, so they are collected, dried and crushed to create red dyes that were highly prized by the early European textile industry and still used today.
(n.): a small flattened insect that feeds on the sap of several plant species, notably the prickly pear. It gives its name to a dark red substance used as a colouring for foodstuffs extracted from the insect. Back
The dye made from the dried bodies of coccid Dactylopius coccus which feeds upon the Mexican Opuntia spp. (prickly pear cactus).