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Ingredients

Ingredient Dictionary

1,5-NAPHTHALENEDIOL

Korean limit
0.5%
Molecular structure

Definition

US FDA substance register · UNII P25HC23VH6 · registered name 1,5-NAPHTHALENEDIOL · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

1,5-Naphthalenediol is the bicyclic phenol that conforms to the formula

Cosmetic roles

Dyes hairHAIR DYEING

Safety & regulatory references

Restricted
South Korea · Taiwan · United Kingdom

Source: ASEAN Cosmetic Directive · EU Cosmetics Regulation · MFDS (Korea) cosmetic regulatory information · Taiwan FDA cosmetic ingredients · Taiwan FDA cosmetic regulations · UK cosmetics regulations (OPSS)

ASEAN

  • Field of application and/or use : (a) Hair dye substance in oxidative hair dye products (b) Hair dye substance in non-oxidative hair dye products
  • Maximum authorised concentration in the finished cosmetic product : (b) 1.0 %
  • Other limitations and requirements : (a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.0 % (a) and (b): The direction for use “wear suitable gloves” must be included in label or leaflet text.
  • Conditions of use and warning which must be printed on the labels : (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) & (b) Do not use to dye eyelashes or eyebrows

China

  • Maximum concentration : 0.5%
  • Maximum concentration : 1%

European Union

  • Product Type, body parts : a) Hair dye substance in oxidative hair dye products b) Hair dye substance in non-oxidative hair dye products
  • Maximum concentration in ready for use preparation : b) 1.0%
  • Other : a) After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 1.0%
  • Wording of conditions of use and warnings : Hair colourants can cause severe allergic reactions Read and follow instrctions

Source: MFDS (Korea) cosmetic regulatory information

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

EU Cosmetics Regulation, Annex III (restricted substances), entry 238 · maximum concentration b) 1.0% · applies to a) Hair dye substance in oxidative hair dye products b) Hair dye substance in non-oxidative hair dye products

Source: EU restricted substances (Annex III)

Restriction III/238 · Other restriction: ban substances that deplete the ozone layer

Source: EU CosIng ingredient list

More data — names, identifiers, properties, test records, literature

Names & identifiers

1,5-NAPHTHALENEDIOLINCI1,5-디히드록시나프탈렌Korean label name (MFDS standard)
CAS No.chemical registry number
83-56-7
EC No.EU chemical inventory number
201-487-4
DTXSIDUS EPA chemical ID
DTXSID2052574
DTXCIDUS EPA compound ID
DTXCID9031147
IUPAC
Naphthalene-1,5-diol
Molecular formula
C10H8O2
Molecular weight
160.172 g/mol

Measured properties

Appearance
Orange powder, [ICSC] · ORANGE POWDER.
Solubility
Solubility in water, g/100ml at 20 °C: 0.06
Melting/freezing point
250 ℃
Flash point
252 ℃(c.c.(calc.))
Vapour pressure
0.00000715 ㎜Hg (at 25℃(est.))
Water solubility
6 g/ℓ (at 20℃)
n-Octanol/water partition coefficient (Kow)
1.82
Auto-ignition temperature
(&amp, gt, 250℃)
Molecular weight
160.2

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 1 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

  • Dye1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

2 skin studies and 2 eye studies are on record.

Classed as moderate1

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 4 studies
  • SkinSens1
    Skin Sensitization · QSAR Predicted
  • Moderate or Mild Irritation
    skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to
  • Severe Irritation
    eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) according to
  • Category 6.4A (Category 2A)
    Eye Irritation · Read Across

Source: US EPA CompTox dashboard

Related literature

Linked databases 26