What are some possible reasons for semen to turn from white to light yellow?

Hydration: Your hydration status, prostate health, and frequency of ejaculation play a role in the appearance of the semen. White to light yellow is the normal color for semen.

Infection?: Semen is typically whitish-gray in color with a jelly-like texture. This can vary slightly depending on your genes, diet, and overall health. Semen can get mixed with leftover urine, giving your semen a yellowish tint. This is most common if you ejaculate shortly after you pee, and it usually isn’t a cause for concern. Some other causes of yellowing include infection in bladder, prostate or STI.