Toilet leaking clean water. From where though???

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I have an unused toilet and it has a puddle right underneath the base. I mop puddle...it returns. I've touched all along the water inlet to cistern, under cistern, u bend where it joins to the waste that exits (it goes horizontally out rather than down) and can't feel any damp so I have no idea where the leak is coming from. The water is clean but then the loo is unused so it would be...

Googling suggests it's the attachment to main waste but it feels dry??? When I close off the water inlet and flush to empty the cistern the leak stops. But there is still water in the pan? It takes at least a day for a puddle to show.

Any ideas?

I'm so thrilled to say I'd already done that of my own thinking :)

I had no food colouring so the cistern has soy sauce.

Pan...not cistern

Do MN sell 'PigletJohn Fixed my Toilet' t-shirts?

Well I was going to suggest a generic PigletJohn Fixed It For Me but shades of Jim'll Fix It might make that an unwelcome idea

wot?

. Water level stable. I know you are dying to know.

Can you talk me through changing my head gasket next. I've googled...apparently its easy.

it is only easy if you have a rather old car. Mark 1 Mini? Ford Cortina? Morris Minor?

Old but not that old (One Republic know about my car). Right orf to bed and I'll check the plight of my loo in the morning. I'm sure all will be well.

The Keep Calm and Piglet John is the only valid use of the Keep Calm thing I've seen.

All good in the bathroom!

Just to mine did as yours and it was overfilling ie not shutting off and leaking out the handle, could yours be seeping out the lid?

Just don't put a bloo block in and go on holiday even if you're sure you know where the leak is coming from cause that would be really stupid and mean you came home to blue ceiling carpet and furniture

If moving the float has lowered the water level, you still need to find out why it was overflowing onto the floor. With the lid off, push the float down so it overfills. Is the white overflow pipe low enough? Does the white pipe take the water into the pan? Is is leaking at the joint between cistern and pan?

When the lid goes on, does it press on anything inside?

It might not be the cistern.

Toilets are constructed with the seat bit inserted into the u-tubey/bending bit. The join is made watertight by a large, wax ring.

We had a problem - and Ive not heard anyone else with the same problem, but I am not a plumber - where the wax had shrunk or something, making the joint slightly less watertight. We had a wet patch which we could not work out where it was coming from. There was no viisble leak - I guess a bit of after leaked out when someone sat on the pan.