Ingredient dictionary

Red 33 (CI 17200)

Also listed as: D&C Red No. 33

Red 33 is a synthetic red dye. Its main job is adding color to water-based products such as bath washes, cleansers, and hair color. It is on the label of 9 products in our library. Checked against our library November 6, 2026.

What Red 33 (CI 17200) does

Gives products a red or pink tint
Colors bath water and cleansing lather
Adds shade to hair color formulas

Red 33 is a synthetic dye, made in a factory from simple chemical building blocks rather than taken from plants or minerals. Formulators use it because it gives a clear, bright red shade and dissolves well in water-based products. A small amount is enough to tint a whole formula.

In bath and cleanser products, it colors the water or lather so the product looks fun to use. In hair color, it adds shade to the mix. Because it is a dye, it can leave a faint tint on surfaces it touches, so rinsing well after use helps keep things clean.

Good for

Suits people who like colored bath products or hair color and have no known dye sensitivity.

Frequently asked questions

Is Red 33 safe in bath products?

Red 33 is widely used in bath and cleansing products, and most people tolerate it well. If you have sensitive skin, try a small test patch first and rinse thoroughly after use. Stop using it if redness or itching appears.

Does Red 33 stain skin or hair?

It can leave a faint tint on skin, towels, or light fabrics, especially with colored bath products or heavy contact. Rinse well and wash fabrics soon after use. Hair color products are meant to color hair, so follow their directions closely.