configuration error

Whilst our bathroom is far from perfect, a new and unexpected fault appears to have developed since I last saw it before leaving for work this morning. For reasons currently known only to him (as he's left his mobile on the mantelpiece here and can't be contacted until he returns) Nicky's dad apparently took advantage of a few spare minutes whilst Nicky and her mum were singing at Edgar to apply some form of coloured substances to the tops of the taps to mark which is hot and which is cold, fortunately getting them the right way round despite his shoe-insole error yesterday. He's never complained about tap-identification on his previous visits but if it was a problem he could have just said and I'd have found a temporary method of indication. My preference would have been to leave it there until he returned, wait and see if he mentioned it and then (if he didn't) start walking about wearing name-badges, explaining that they are a preventative measure in case he was about to paint our names on our foreheads to more easily identify us if asked. Nicky instead removed it with some acetone which has also removed the remaining (faded, but legible) text indicating hotness and coldness which had previously been sufficient. I'm now extremely worried about what else he might have done to the flat over the past couple of days as half the reason for their visit is to paint the walls whilst I'm at work and Nicky is out and about socially networking with othermothers. I was going to pop there later to get a skirting board sample but shall leave it until the morning in case I see something upsetting; I shall just go for a quick bicycle-and-muffin-purchase instead.