Revelation 18:16 'Woe! Woe, O great city, dressed in fine linen, purple and scarlet, and glittering with gold, precious stones and pearls!"

The american flag is red, white and blue. Linen is white, scarlet is red, but the one that stumped me was the description of purple instead of blue.

Until I looked up the original greek word, which was porphura.

4209 porphýra – purple, symbolic of "royal status" (L & N, 1, 79.38). There were three familiar shades of purple in the ancient world: deep violet, deep scarlet (or crimson), and deep blue (WP, 2, 220).

Here, see for yourself in Strong's Greek Dictionary: [link to concordances.org]