At the time, Technicolor's two-color process employed red and green dyes, each with a dash of other colors mixed in, but no blue dye.

Are all red dyes made from insects or just specific red dye numbers, such as red dye number 3?

Beetroot juice, not very herbal, but it dyes red, as you've just found out.

During the English Civil War red dyes were imported in large quantities for use by units and individuals of both sides.

Madder Lake contains two organic red dyes: alizarin and purpurin.

One reason for its popularity is that many commercial synthetic red dyes were found to be carcinogenic.

Also from the Tzapoteca country came bags of the dried little insects which yield the several brilliant red dyes.

I will barter for nothing but items like the red dyes and the rarest feathers.

The process combined red and green dyes to create a color image with a reduced spectrum.

Ms. Auth beleves that these purples are a combination of red and indigo blue dyes.