How to Say "auburn" in Spanish
The Spanish word for “auburn” is “castaño” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi hermano tiene el pelo castaño y los ojos verdes.
My brother has brown hair and green eyes.
Ella prefiere teñirse el pelo de un tono castaño claro.
She prefers to dye her hair a light brown shade.
Ese color castaño le queda muy bien con su piel.
That chestnut color looks very good on her skin.
Matching the word it describes
Like most adjectives, this word changes to 'castaña' if you are describing something feminine, and adds an 's' if there is more than one thing.
Specific use for looks
In Spanish, we almost always use 'castaño' instead of 'marrón' when talking about hair or eye colors.
Using 'marrón' for hair
Mistake: “Él tiene el pelo marrón.”
Correction: Él tiene el pelo castaño. (While 'marrón' isn't technically wrong, 'castaño' is what native speakers actually say for hair.)
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