Looks like you sorted the bleach transparency (additive) colours.

If anyone is interested in a bit of explaination.

The Black background is used for the additive example because the lack of light is black. Adding the primary coloured lights Red, Green, and Blue they combine to become other colours with all colours making White.

In a similar manner begin with a White background and subtract colours Cyan, Magenta, and Yellow, which eventually removes all colours to reveal Black.

Artist using pigments for paints are more familiar with the Primary pigments Red, Yellow, and Blue which work similar to subtractive colours of light. Although you get a muddy brown rather than a Black.