Why is pink and powder the same word?

Chinese characters are polysemous.

the following is the dictionary explanation of pink.

powder

fěn

fine powder: powder. Powder. Dust. Rice noodles. Pollen. Powder. Bleaching powder

refers to the powder used for cosmetics: fragrant powder. BLACKPINK's debut. Daidai Powdering Cream.

painting: painting. Whitewash.

break into powder: smash. To pieces.

white or powdered: powder wall. Pink butterfly Powder paper. Chalk.

Food made of bean flour or other flour: vermicelli. Bean jelly Powder skin. Powder mites (qi). Rice flour meat

light red: pink. Pink flower.