changing water material color value breaks it

[peterbrinson]

Unreal 5.2.1
Having fun making rivers. I’ve tried different scenes with different terrain; two different projects; and also in both Unreal 5.1 and 5.2, I have this issue:

When I edit my river “Water Material” - Absorption - whether I edit the default material or I made an instance - making changes in the color wheel and the saturation work great. But as soon as I make an adjustment to the value, the river turns dark and subsequent changes to Value do nothing.
I have to either replace the material file with a backup or make a new instance from an unaltered one.
Here I’m trying to make it a bright pink. You can see redness in part of the water.
https://drive.google.com/file/d/1d8P5WZLTjfAEgBh6OLbXlTTUMZf_8-dm/view?usp=drive_link

Thank you.

(I am new to this side of Unreal, so consider that).

[Arkiras]

Absorption isn’t a color, it’s the rate at which the RGB wavelengths are absorbed based on depth. Trying to use HSV to control it is going to be very unintuitive, I’d encourage you to read the Single Layer Water docs to better understand how it’s set up: Single Layer Water Shading Model in Unreal Engine | Unreal Engine 5.2 Documentation