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1-Naphthol and Blue 1 (Ci 42090) are both added colour ingredients. 1-Naphthol is found in 1 product while Blue 1 (Ci 42090) appears in 11, making Blue 1 (Ci 42090) the more widely used option.
Added colour
Added colour
Olia Hårfarge Metallic Silver 9.11
1-Naphthol is categorised as "Added colour" while Blue 1 (Ci 42090) is categorised as "Added colour". They serve different functions in skincare formulations.
In most cases, these ingredients can be used together. However, always patch test and introduce new ingredients gradually.
1-Naphthol is found in 1 products, while Blue 1 (Ci 42090) is found in 11 products in our database.
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© 2026 Gracie. All rights reserved. Data sourced from Open Beauty Facts (ODbL) and EU CosIng.