white: the pale, bright color of milk, snow, or bleached wool
This is the ordinary color word for white. It describes everyday white things: the bare white of peeled poplar wood, the manna that lay white on the ground, teeth gleaming white from milk, and the clean white clothing of a festive person.
Its heaviest use is in the laws about skin disease (Leviticus 13), where a priest inspects for hair that has turned white and for pale, whitish patches on the skin. Here the word is a plain clinical marker used to tell one condition from another, with no good or bad meaning attached to it.
The same word colors the horses in Zechariah's night visions, where white stands alongside red and other colors to mark out different riders. Across all of these settings the sense does not change: the word simply means white.