For my conditions, it seems that 50/50 hardwood saw dust/wheat bran is performing better than standard masters mix. It's probably a hair too humid for it in my tent, but it's gotta be higher for the oysters that are fruiting now.
(That is a 5lb block of substrate)
Is it safe to pet?
Absolutely! It feels interesting at this stage since the spines have just started to grow out. Unfortunately, I can let them reach their full glory because the fruit turns bitter later in development.