Dangerous precedent Paul sacred ground and all that. My experience goes back nearly sixty years when we lived in a three metre square wooden shed with Malthoid (tarred paper) on the roof in a corner of our building block being a dutiful (not broken in ) husband I noticed that the family gifts of chinaware often had small cracks since I came from a Mum who used near boiling water the fizzes from these alarmed me so because we were the first to move on our block no neighbors etc I went to the door and threw the stuff away.Now sorry to say I have never been invited back to the kitchen sink this last sixty years.The memory lingers.
Peter.