I was making lye using a skull cup. I put the lye in a large container. When I got a rare lye [lye] I put it in a bucket because it cannot be mixed with the normal lye in the large container. Later I needed to make some leather, so I transfered the rare lye from the bucket into a different skull cup (this one a souvenir from Blackmoor 2018 Impalong). The lye becomes normal [lye]. After using part of the lye in the cup, I cannot refill the cup from the bucket because "That would destroy the liquid." I cannot transfer the remaining lye from the cup back to the bucket because "That would destroy the liquid." I used up the lye and transferred more rare lye into the cup with the same result.