1960's book about a plague that kills all white people

Question

Paperback, read in the UK about 1975, setting USA and the UK. The plot was a pandemic that was killing all white people (I think also Asians and Orientals but not sure)

There were like Black Power groups fighting for power and also church leaders making their own grabs for control

Then rumours begin about 'The Floured Men' who are allegedly a couple of men trying to fetch back the olden days of white people in charge by going 'whiteface'

Note: Although I read this in the mid-seventies it was a few years old and 'of it’s time' Therefore some racist phrases were casually used

It transpires that the Floured Men are actually white survivors so there is an assumption that things will now get back to normal with them running things

Answer 1

This is Robert Bateman's When the Whites Went

Book subtitle: 50 million white people lie dead- victims of the mystery killer that rages from city to city.

His sf novel, When the Whites Went (1963), is set in an England where only blacks survive a disease to which all others fall victim.

Found by doing a Google Books search for "The Floured Men", which came up with the following:

Armina ate the Floured Men's food and drank from their flasks of water. But she said little. They were not Floured Men, of course, and that was even more terrifying at first than the eerie prospect of a new religion more powerful than Waldo's.