These are resources for building your own hex colour charts for markers or other media to help pick close colours for blending and gradients. Initially, these are templates for manually create and picture hex charts, but tools to turn those into
How-to guide (more detail coming)
PIck the template for the medium/pen you have, print a copy on suitable paper for the medium
Color each of the hexes with the matching pen (optionally write over dark hex with the code in white pen)
(optional) stick the coloured sheets into magnetic backing for easier arranging
Cut the template into horizontal strips, then cut between the hexed to separate them
Arrange the hexes by colour to create your own color chart.
I've illustrated an example of this process for the Ohuhu skin tone is on reddit
Here are eaxmple hex charts. Once the tooling is done there will be a library of hex charts that the community has made.
Ohuhu Honolulu markers
These are all small PDF files. They will open in Google Drive and you can download them with the download icon ⬇ on the top right
Ohuhu Honolulu markers
Ecoline watecolour brush pens