It's Bottled Ectoplasm! They glow in the dark.
Three of them now for sale on nymla.etsy.com :D
Ectoplasm is a substance which looks and feels like jelly, but if you watch it in the dark you may notice something strange about it - it glows!
This is a materia that is formed when a ghost is just on the border between the living and the dead, most often during a seance by a physical medium. The medium enters a trance and finds contact with a spiritual entity, whereafter this luminous matter can be encountered in places where the ghost has been located.
And the lower photo: just something from my little workshop. Moss in a bucket.