So let me try to explain my intention better:
* Primary color = main theme color, from which are derived  all other entities (such as link, background, etc)
* Text color (or base color) = color of regular text (usually some derivation of black color)

* Then we need some color, which is contrast to primary background. So if we have button with primary background, we also need text on it readable. And that's the color I am trying to get into alchemy-base and which we are searching the name for.