lime

 Pour lime wall dressing from it's thirty kilo bag into a mixing bucket with seven litres of water in it. Pick up the red electric mixer and push it into the mass of water and powder. Press the button and hold the mixer tight. Incline the mixer to the right and to the left so that the mixture is even, so that the water and the white powder are well mixed.

Then leave the mixture to rest awhile.

With a big square plastic brush and a bucket of water wet the walls in the upstairs bathroom. These walls are covered in all kinds of paints based on lime or chalk. 

Put on a pair of rubber gloves. The lime in the wall dressing will eat away the skin on the hands otherwise.

Then start to apply the dressing to the walls with a smoothing trowel.

This nonsense is going to take all day,but afterwards it will be done, and the walls in what will be the sons bathroom will have a uniform coating.