No purple in Purple Gelato 😞

Hi , if someone can help me please , im growing 8 from 12 seeds of that purple cultivar I purchase from Homegrown and I’m in 7th week and there’s more purple hairs on other strains like wedding cake . Anyone knows in which week you get the purple colors ? By the way the temperature in the room daytime is between 75 and 80 F and at night goes down between 53 and 59 F.