Depending on what exactly your figures were/are, you might benefit from the viridis colour map, available in matplotlib and R (and probably in many other places). It's colourful, so those without colour blindness get a richer display than if you used greyscale, and the colours chosen aren't too affected by most common forms of colour blindness. But for those that really can't see the colours, even if you literally just convert to monochrome, it still works. It also looks nice :-)

Here's a talk by the creators: https://www.youtube.com/watch?v=xAoljeRJ3lU

Here's a little article about it (with some R specifics): https://cran.r-project.org/web/packages/viridis/vignettes/in...