hydroquinone

hydroquinone

A chemist carefully measures hydroquinone in the laboratory.

Definition
  1. Noun:
    • Chemical compound: "hydroquinone" is a white crystalline organic compound (C₆H₄(OH)₂) used primarily as a photographic developer, an antioxidant, and a skin-lightening agent. It is a type of dihydroxybenzene, meaning it has two hydroxyl groups attached to a benzene ring.
Usage Examples
  • Noun:
    • The photographer used a solution of hydroquinone to develop the black-and-white film. (Hydroquinone acts as a reducing agent in photographic development.)
    • Some skin creams contain hydroquinone to reduce hyperpigmentation and lighten dark spots. (Hydroquinone inhibits melanin production in the skin.)
Advanced Usage

  • "hydroquinone as a reducing agent": In chemistry, hydroquinone readily donates electrons, making it useful in redox reactions.

    • In the photographic process, hydroquinone reduces silver halide crystals to metallic silver. (Hydroquinone transfers electrons to silver ions, causing them to become visible as black silver particles.)

  • "hydroquinone in cosmetics": Hydroquinone is a common ingredient in over-the-counter and prescription skin-lightening products, though its use is regulated due to potential side effects.

    • Dermatologists often prescribe a 4% hydroquinone cream for treating melasma. (A concentration of 4% is typical for medical use.)
Variants and Related Words

  • Hydroquinone derivative (n): a chemical compound structurally related to hydroquinone, such as monobenzone or arbutin.

    • Monobenzone is a hydroquinone derivative used for permanent depigmentation. (It is a more potent variant with different applications.)

  • Quinol (n): an alternative name for hydroquinone, especially in older chemical literature.

    • The term "quinol" is sometimes used interchangeably with hydroquinone in industrial contexts. (Both refer to the same compound.)
Synonyms
  • 1,4-dihydroxybenzene: the systematic IUPAC name for hydroquinone, indicating its chemical structure.
  • Benzene-1,4-diol: another systematic name, emphasizing the two hydroxyl groups at opposite positions on the benzene ring.
Related Idioms (None directly applicable; hydroquinone is a technical term without figurative use.)
Phrasal Verbs (None applicable; hydroquinone is a noun and not used in verb phrases.)
Related Idioms (None applicable; the word is purely technical.)