Ok, so this isn't strictly the sort of thing you should post on a food blog, but it's too tempting. I found this at work in a big pile of things donated to us by the British Red Cross. It seems to date from around the 1950s/early 60s. Finally, a proper use for Bisto!
I recommend trying out a batch now in advance for Halloween!
1 level teaspoon amaranta
1 level teaspoon gerenine
2 level teaspoons tartrazine
4 level teaspoons custard powder
2 level teaspoons liquid detergent
32 ozs. water (just over 1½ pints)
Bring the water to boil. Add colourings. Blend custard powder to smooth paste. When mixture is boiling add custard powder and stir well until it thickens. When cool add liquid detergent.
Dyes can be obtained from:-
West Pier, Brighton
Bread crumbs mixed with polycell, add either Bisto or blood to water for colouring.
Nylon stockings stuck to real skin with collodion or copydex.
Equal parts of greasepaint and vaseline together.
Liquid blood with Dr. Wernets toothpowder stirred in.