When does koi carp show their true color?

Question

i have about 40, 3 months old koi fry. They are red, yellow and some of them are gray, some of them have 3 color (red, white and black) but they keeps on chaing color every week. I just want to know when does their color remains constant? How many months later?

Answer 1

may be they give u color after 5 month

Answer 2

wait a few more months

until they get bigger