u/ChangingSun

Hello everyone, my partner and I are trying our hand at growing mushrooms (B+ I believe) since we ran out of our last batch. Things were going smoothly until I noticed a weird bluish spot on the base of one of the stems last night. I waited until morning so that I could see it better in the light and found there's a another stem with the same spot but its much lighter. I'm worried its contamination but my partner doesn't believe it is. To our eyes, the substrate seems fine but since neither of us are very experienced in this, I wanted to ask what y'all think?