Chromium (III) hydroxide
CI 77289
Chromium (III) hydroxide appears in Annex IV as a positive-list colorant entry for EU cosmetics.
Chemical identity and properties
C.I. Pigment Green 18
- IUPAC name
- bis(chromium(3+));tris(oxygen(2-));dihydrate
- Molecular formula
- Cr2H4O5
- Molecular weight
- 188.02 g/mol
- Exact mass
- 187.886883 Da
- Topological polar surface area
- 5.0 Ų
- Hydrogen-bond donors
- 2
- Hydrogen-bond acceptors
- 5
- Covalent units
- 7
- Defined stereocentres
- 0
Also known as
8 more reported names
Evidence from additional scientific databases
NIH PubChem PUG-View
Attributed physical-property, hazard, environmental and use annotations.
- Physical Description: Dry Powder Source: EPA Chemical Data Reporting (CDR)
- Physical Description: Light green finely divided powder; [MSDSonline] A brilliant emerald-green pigment called Guignet's green; [Ullmann] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- Note: This chemical does not meet GHS hazard criteria for 91.7% (11 of 12) of all reports. Source: European Chemicals Agency (ECHA)
- GHS Hazard Statements: Not Classified; Reported as not meeting GHS hazard criteria by 11 of 12 companies (only 8.3% companies provided GHS information). For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
- ECHA C&L Notifications Summary: Aggregated GHS information provided per 12 reports by companies from 2 notifications to the ECHA C&L Inventory.; Reported as not meeting GHS hazard criteria per 11 of 12 reports by companies.; There is 1 notification provided by 1 of 12 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
- Industry Uses: Pigment Source: EPA Chemical Data Reporting (CDR)
- Sources/Uses: A purified colorant used to color various foods, drugs, and cosmetics; [MSDSonline] Hydrated chromium oxide green is a pigment similar to Guignet's green; it is prepared differently and has less intense color; [Ullmann] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Record details
Warnings
free from chromate ion
Colour index or glossary
CI 77289
Chemical name
Chromium (III) hydroxide
Chemical / IUPAC name
Chromium (III) hydroxide
Color
Green
Regulatory information
Identified ingredients
Key data
Inventory links for Chromium (III) hydroxide
Related records for Chromium (III) hydroxide
Direct matches are limited for this record, so nearby entries from Annex IV are shown as well.
CI 77268:1
CI 77491
What Annex IV means for Chromium (III) hydroxide
Chromium (III) hydroxide is an approved colorant listed in Annex IV of EU Cosmetics Regulation 1223/2009. Only colorants on this positive list may be used to colour cosmetic products on the EU market.
Some colorants in Annex IV are restricted by product type — for example, prohibited from use around the eyes or in products applied to mucous membranes. Check the product type and conditions fields above before use.
This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.
Compliance checklist
- Confirm colorant is used only in permitted product types listed above.
- Record the Colour Index number and CAS identifier in the ingredient declaration.
Frequently asked questions
Source note for Annex IV record Chromium (III) hydroxide
This page summarizes one Annex IV record for Chromium (III) hydroxide from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.
Use this record page to review Annex IV conditions for Chromium (III) hydroxide, but confirm any final regulatory decision against the current official annex wording and source files.
Tools & next steps
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