Bloody screen, how to ?

So in order to get blood screen what was needed in order to achive it ? i don’t know where to begin to.

Use a Post Process Material and use an Image with Blood as Emissive and The mask of your blood as Opacity.
Lerp the Blend Weight in your Camera Settings when needid.

Is this what your looking for?

Ok i see thanks for the help, party that’s exacly what im looking for.