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1-Naphthol and CI 42090/BLUE 1 are both added colour ingredients. 1-Naphthol is found in 1 product while CI 42090/BLUE 1 appears in 7, making CI 42090/BLUE 1 the more widely used option.
Added colour
Colour pigment
Olia Hårfarge Metallic Silver 9.11
1-Naphthol is categorised as "Added colour" while CI 42090/BLUE 1 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 CI 42090/BLUE 1 is found in 7 products in our database.
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