Toriyama-sensei’s assistants were busy when the decision was made to make Super Saiyan Goku’s hair golden blond and Toriyama-sensei wanted to eliminate the labor involved in coloring characters’ hair black, golden blond hair helped with work efficiency.
When it is time to draw gold or golden blond Super Saiyan hair, it can remain white in a typical black-and-white manga chapter.
Is having golden blond hair associated with being stronger? Nope, we’ve seen in recent episodes Goku with his black hair in Ultra Instinct is way more powerful than in of his Super Saiyan forms.
The true reason for why Super Saiyan hair is golden blond?