Use Dye to Increase Unexplored Map Contrast

The colour of sand and unexplored areas of maps are hard to tell apart.

To remedy this, I would like to be able to dye a map (both before and after using it for the first time).

The unexplored areas of the map would show as the colour of the dye.

Dying a map could be done by dipping in a cauldron, or by adding dye to the second slot in a cartography table.