ACID RED 52

RestrictedCAS 3520-42-126 regulations across 16 markets

ACID RED 52 is a cosmetic ingredient classified as Hair Dyeing. Also known as CAS 3520-42-1. It is regulated in 16 markets including UAE, Bahrain, European Union.

Also Known As

CAS Number: 3520-42-1

Market Overview — 29 Markets

European Union2

United Kingdom3

United States

California

Maryland

Washington

Canada

Brazil

South Korea2

Japan

Taiwan1

Australia

Singapore1

Malaysia1

Thailand1

Indonesia1

Vietnam1

Philippines1

UAE2

Saudi Arabia2

Qatar2

Oman2

Kuwait2

Bahrain2

Russia

Belarus

Kazakhstan

Armenia

Kyrgyzstan

Detailed Regulations

Europe5 regulations

European UnionRestrictedAnnex III #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt; CI 45100 (see note 17)
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products
Conditions of use: 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.
Other conditions: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5%.

Source: EC 1223/2009 Annex III

European UnionRestrictedAnnex IV #71

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt
CAS: 3520-42-1
Product type: Rinse-off products
Color Index: CI 45100

Source: EC 1223/2009 Annex IV

United KingdomRestrictedAnnex III #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt ; (CI 45100)
CAS: 3520-42-1
Product type: (a) Hair dye substance in oxidative hair dye products
Conditions of use: (a) To be printed on the label: The mixing ratio. 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. Hair colourants can cause severe allergic reactions.
Other conditions: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1,5 %.

Source: UK retained EC 1223/2009 Annex III

United KingdomRestrictedAnnex III #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt ; (CI 45100)
CAS: 3520-42-1
Max concentration: (b) 0,6 %
Product type: (b) Hair dye substance in non-oxidative hair dye products
Conditions of use: Max: (b) 0,6 % (a) To be printed on the label: The mixing ratio. 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. Hair colourants can cause severe allergic reactions.
Other conditions: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1,5 %.

Source: UK retained EC 1223/2009 Annex III

United KingdomRestrictedAnnex IV #71

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt
Product type: Rinse-off products
Color Index: 45100

Source: UK retained EC 1223/2009 Annex IV

AmericasNo restrictions

No specific restrictions for ACID RED 52 in United States, California, Maryland, Washington, Canada, Brazil.

East Asia & Oceania3 regulations

South KoreaRestrictedAnnex restricted #M1067

Chemical name: Acid Red, Aka106, CI 45100
CAS: 3520-42-1
Conditions of use: * 배합한도 : 적용 후 바로 씻어내는 제품 및 염모용 화장품에만 사용

Source: MFDS Korea Cosmetics Regulation

South KoreaRestrictedAnnex restricted #M1315

Chemical name: Acid Red 52, Aka106, CI 45100
CAS: 3520-42-1
Conditions of use: * 배합한도 : 0.6% 염모용 화장품에만 사용

Source: MFDS Korea Cosmetics Regulation

TaiwanRestrictedAnnex Restricted Ingredients List #135

Chemical name: Hydrogen-3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt (CI 45100)
CAS: 3520-42-1
Max concentration: (a)1.5% (b)0.6%
Product type: (a)Oxidative hair dye products (b)Non-oxidative hair dye products

Source: TFDA Cosmetics Regulations

ASEAN6 regulations

SingaporeRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

MalaysiaRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

ThailandRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

IndonesiaRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

VietnamRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

PhilippinesRestrictedAnnex ACD Annex III (Restricted) #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4- disulphonatophenyl)xanthylium, sodium salt / Acid Red 52
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products Use for dyeing eyelashes and eyebrows is not permitted.
Conditions of use: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5 %. The free base and salts of this hair colouring ingredient, unless prohibited under Annex II, are permitted for use. The direction for use 'wear suitable gloves' must be included in label or leaflet text. | Label: (a) The mixing ratio must be printed on the label. Hair colorants 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 (a) and (b) Do not use to dye eyelashes or eyebrows

Source: ASEAN Cosmetic Directive (HSA Dec 2025)

GCC12 regulations

UAERestrictedAnnex III #193

Chemical name: Hydrogen 3,6-bis(diethylamino)-9-(2,4-disulphonatophenyl)xanthylium, sodium salt; CI 45100 (see note 17)
CAS: 3520-42-1
Max concentration: (b) 0.6%
Product type: (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products
Conditions of use: 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.
Other conditions: (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.5%.