this is a configured material for artistic lighting LutLight
https://github.com/NullTale/LutLight2D

it uses a lospec500 palette that's customised to create unusual materials
https://lospec.com/palette-list/lospec500

in order to use thouse color ramps you need to use unity urp with 2D lighting mo detailed instructions by the links
configured urp asset can be found in materials folder