colour line

So long as the colour line is the dividing line in politics, so long will there be trouble.

Brazil has never had a “colour line,” and there has never been any popular prejudice against race mixtures.

It proves that there is neither caste, creed nor colour-line in the pocket-book.

I might fix up a black gin for him, but I suppose he'd draw the colour line.

The colour line is drawn, but neither race knows just where it is.