As you are brousing the shelves of the ointment shop you come across a small porcelain jar that doesn't appear to have a label. You pick it up and give it a little shake. You can't detect anying inside it.
You take it to the shopkeeper behind the counter. "Excuse me, can you tell me what this is please?" you ask the elderly oriental
"Alas, I do not know." he replies "I haven't been able to get the lid open. You can take it if you want, only half price."
Thanking him, you leave the shop and head for home. There you will try to get the lid off and find out exactly what's inside it.