This mod changes the quality of the blood in Clear Sky.
It makes it appear more realistic by making it look wet, chunks of gore are mixed in with the blood textures, the blood colour is more realistic as are the blood puffs which appear when someone is shot.
Place the RAR file in your S.T.A.L.K.E.R. - Clear Sky folder
C / Program Files / Deep Silver / S.T.A.L.K.E.R. -Clear Sky
If you have other mods, you will have to make manual changes to your system.ltx:
The changes are in the readme included in the .zip