Black, The Blood of Evil was originally published in MV Features' Secret Service Picture Library #21:
The cover was cribbed by Keith Chatto for Page Publications' Terror Story Library #2:
Page Publications reprinted the story under another Chatto cover in Nightmare Suspense Library #8:
This cover would be recycled itself.
And later still, Black, The Blood of Evil was published in Mystery Suspense Library #3:
There are probably more publications with this story - possibly featuring a cover based on interior art. TBC.