I have now added real photos to the site for most filaments, some still look a bit off such as the dark grey and muted colours but please use these photos as guides, the renders are honestly way more accurate for most filaments. I did spend a bunch of time trying to make the colours as good as possible but I still fked up.
So please use a combination of the renders, listed hex codes, and photos of the filament to make the most informed decision.