Ironic that Eiji Tsuburaya told Noriaki Yuasa to stop putting this type of stuff in his Gamera movies! Yet he did it in UltraSeven!
So long as the blood wasn't
red, it was okay.
Although Eiji Tsuburaya did not want to show bloodshed, he did do it on a number of occasions.
Godzilla Raids Again, in B&W, had Godzilla killing Anguirus by biting him in the neck, with blood leaking from the biting. Monsters occasionally had red, blood-like wounds, like Gaira in
War of the Gargantuas, but no actual blood. It was after Episodes 8 and 10 of
Ultraman that Eiji decided not to show any more blood shed, but if he had to, like in
Ultra Seven, the blood couldn't be red! (Ultra Seven's beheading of Giladoras in Episode 20, "Destroy Epicenter X!", was one of the cleverest, as it wasn't blood, but red crystal rocks!) Noriaki Yuasa followed suit, making sure that the monster blood in the Gamera films wasn't red, as it would frighten young children.
It was after Eiji's passing that the violence and bloodshed was more extreme. You had Godzilla bleeding for the first time in
Godzilla Vs. Gigan, monster bloodshed up the wazoo in
Godzilla Vs. Mechagodzilla, and fairly disturbing monster violence like in
Ultraman Ace! Wow!
If a live-action
Devilman were done in the 70s, it'd look a lot like this!