Its hard to say but your mycelium might be drying out as it grows, blue is an indication of oxidation in most hallucinogenic varieties. I read somewhere it's not actually the psilocin if I find it I will source. I wouldn't be worried, just cautious, if any other funky colours start popping in I would get them out of there, as well on top a fridge may slow things down, when I did mine I kept it beside the furnace, in the cold room. It isn't cold, but its not hot either. I forget the real temp's for colonization, do a google search with your variety and adjust your stats accordingly.
Peace
well i have Sta-Green verm,organic brown rice flour, so they have been in the dark above the fridge for about a week & 1/2,and no white just some grey, off white almost faint blue stuff kinda poking it's way out to the sides of the glass. The question is ,is this ok?i have not seen this on any videos or pictures of colonized substraght should i wait longer ?