HC Yellow No. 4

HC Yellow No. 4 molecular structure
molecular structure · PubChem
AKA: 59820-43-8, 2-((2-(2-Hydroxyethoxy)-4-nitrophenyl)amino)ethanol, O-Di(2-hydroxyethyl)-2-amino-5-nitrophenol, HC Yellow 4, Ethanol, Colorex HCY4, 2-(3-Nitro-6-(beta-hydroxyethylamino)phenoxy)ethanol
Synthetic
Not Clean
2-[bis(2-Hydroxyethyl)amino]-5-nitrophenol
Solubility less than 0.1 mg/mL at 68.9 °F (NTP, 1992)
Formula
C10H14N2O5
Mol. Weight
242.23
CAS #
59820-43-8
Form
Powder
State
Canary yellow fluffy powder. (NTP, 1992)
Functions
Hair Dyeing
Colors Hair
Traditional Use
A synthetic aromatic dye created for hair coloring applications in the 20th century, designed to provide yellow coloration in semi-permanent hair color formulations with good stability.
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Regulatory Status
USA✔ permitted
EU✔ permitted
JAPAN✔ permitted
CANADA✔ permitted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR