When a part is listed with color (not applicable), the sample image is white.
When listing white parts, this can cause confusion because they wouldn't
come up in a search for white and the error is hard to detect. When the parts
are actually some other color, the confusion is more obvious.
Perhaps the Not Applicable image could be a line drawing or otherwise altered.
Could you give an example? Not applicable is primarily used for stickers and part assemblies. In Suggestions, KingAlanI writes: [...] (95 months ago, Aug 7, 2016, to Suggestions)