Goldfish color.. questions...

Just had a odd question.

We just have the 26 cent walmart goldfish in our pond.

All the ones we purchased are bright orange color, some with white or black
accents.

Most of the first spawn are also gold, but about 1/2 of them are dark
colored.

I remember reading that fry start out dark, but then turn gold once they
get a little older, and we did see that happening, but some just remained
that dark color!

Is that common?

Gareee©
(Gary Tabar Jr.)