Uncolored (adjective)

1. Not having been given color or not having color.
2. Not having been painted or dyed.

Origin:

Un- + colored.

Examples:

1. The paper was uncolored and white.
2. The photograph was uncolored and black and white.
3. The uncolored glass was clear and transparent.
4. The uncolored walls were plain and bare.
5. The uncolored hair was its natural grey.