CI 45410

CI 45410 is a synthetic red-pigment and dye.

It often goes by both Red 28 or Red 27; manufacturers label both ingredients as CI 45410.

This dye is commonly found in makeup because it imparts a vivid color. Some types of this dye change color based on pH level and interaction with moisture:

• Clear color: pH below 4.0 and no moisture
• Clear color: pH below 2.5 and contact with moisture
• Dark Pink: pH above 4.0 and contact with moisture
• Light pink: pH between 2.5 and 4.0 and contact with moisture

Your skin has a natural pH of around 4.5 - 5.5.

According to the FDA, CI 45410 is not permitted for use in eye products.

Red 27 is a flourescein dye and commonly used as a fluorescent tracer in medicine.