Apart from this blog, I also told some other things that might be interesting for you. Here are the resources that have been translated into English.
A series of articles on text colour contrasts:
- Text Colour contrasts (Part 1): who is it for and what are the accessibility rules?, on Tanaguru’s blog, 19 July 2019;
- Text Colour contrasts (Part 2): How to choose the right colour combinations for my website?, on Tanaguru’s blog, 25 July 2019;
- Text Colour contrasts (Part 3): the contrast improvement mechanism, on Tanaguru’s blog, 9 March 2020.