Tren can come in many colors. The longer it sits in raw form, the more it oxidizes. I've brewed tren that was crystal clear, it blew my mind so much I questioned whether it was tren at all and sent it in for testing. I brewed the second half of the raws a month later and it came out orange. So it can happen just from the same batch of raws. Other influencers can be heat during manufacturing and/or compounding.