I have a drawer full of spools of thread accumulated over 60 years of sewing, I use odd colors for piecing printed fabric and matching thread where it shows, like top stitching. With white I do use white because a red seam would deter from the looks and might even fade when washed. Use up your near-empty spools on scrap sewing but test it first, if it tears too easy, it is rotten and won't hold up under use.
Carol J.