Here is a guide on how to get bloody hands and weapons in Black Mesa.
(NOT MY IMAGE)
This feature was later removed due to performance issues. But there is still a way to enable it. And it’s a lot easier than expected.
How to Get Bloody Effects
- Black Mesa: How To Enable The Classic Source UI
- Black Mesa: Singleplayer FPS Hotfix
- Black Mesa: How to Get items through the Teleporter Maze in Lambda
- Black Mesa: “The Plan” Achievement Guide