An indirect question on this. I realize blood isn't fire engine red.
In a diorama, say 1/48, 1/35 ish or even 1/8 how do you represent blood. Fire engine red or the dark ruby-purple brownish color of real coagulated/dried/drying blood?
If you use the real color it may not come across as blood, looking more like a dark smudge, oil, dirt stain, etc.
If however you go with unrealistic reddish color blood any observer is immediately gonna know what it represents. It puts me in mind of how stage actors use exaggerated gestures because a normal gesture looks half hearted or isn't noticeable from where the viewers are watching.