One who heard us was a woman named Lydia, from the city of Thyatira, a seller of purple goods, who was a worshiper of God. Acts 16:14 [ESV]
I'll say it straight to Alice Walker's face: Veil for prostitutes and genderqueer beasts— A color fit for hierophants and priests; Symbol of both the decadent and base. A hue unfit for tablecloths at feasts . . . Scarlet is regal. Blue, too, has its place. Let Thyatiran Lydia state her case, But purple celebrates strange swelling yeasts. No fault in bordering on indigo As long as chroma stays within the blue. But mix it up with red? Don't do it. No. Yet, good contrast to yellow's golden grail . . . What says the holy humble Murex snail? Feel me: PURPLE is not the way to go.
Prompt 21: write a poem that repeats or focuses on a single color.