PLDEFRESITJęzyk: polski
INCI name

CI 45100

CI 45100 (Acid Red 52)

ColorantHair dyeingreviewed

A red xanthene colourant.

What it is

CI 45100 is a synthetic xanthene dye, the sodium salt of a sulfonated rhodamine. CosIng lists it as colorant and hair dyeing. It is regulated in Annex IV (colourants) and Annex III of the EU Cosmetics Regulation.

Where it is used

Found in rinse-off products such as shower gels, soaps and shampoos, and in some non-oxidative and oxidative hair dyes.

Limits of interpretation

The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.

Annex IV allows it as a colourant only in rinse-off products, and Annex III sets conditions for its use in hair dyes; see the EU regulation section for the applicable limits.

Functions

Colorant
Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light; (precursors of oxidative hair colorants shall be deemed colorants). All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.
Hair dyeing
Imparting color to hair. Hair dyeing preparations may be temporary, semi-permanent, permanent, depending on the length of time the colorant remains on the hair.

EU regulation

EU · Annex IV, entry 71Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt
Maximum concentration
Rinse-off products
As of
3 November 2026 · (EC) 2009/1223
EU · Annex III, entry 193Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt; CI 45100 (see note 17)
Product type
(a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products
Maximum concentration
(b) 0.6%
Conditions and warnings
a) To be printed on the label: The mixing ratio. “ Hair colourants can cause severe allergic reactions. Read and follow instructions. This product is not intended for use on persons under the age of 16. Temporary ‘black henna’ tattoos may increase your risk of allergy. Do not colour your hair if: — you have a rash on your face or sensitive, irritated and damaged scalp,— you have ever experienced any reaction after colouring your hair, — you have experienced a reaction to a temporary ‘black henna’ tattoo in the past.
As of
3 November 2026 · (EC) 2013/344

Products with this ingredient (49)

Check a full ingredient list