For your indoor and outdoor signage, safety signs and architectural signs to be accessible for blind people and those with visual impairments, you need to achieve a contrast between the two colours used for the Braille and relief signage.
The French law of 11 February 2005 guarantees accessibility to everything for everyone. Braille and relief signage adapted to the needs of the blind and those with visual impairments must be used in buildings that are accessible to the public.
The colours used must be contrasted with the background and limited to two.
The difference in contrast between the support base used and the colours used must be at least 70%.
How to select colours so the contrast complies with the French law of 11 February 2005
This graphical charge is a guide to help you select the colours: