What is this part

This is the yognog bath bomb and I’m just wondering if this part in the middle that looks like butter is for Color or I couldn’t really figure out anything when I looked on the Lush app, but I’m just curious if anyone knows

This is the yognog bath bomb and I’m just wondering if this part in the middle that looks like butter is for Color or I couldn’t really figure out anything when I looked on the Lush app, but I’m just curious if anyone knows