South wall

It's been a long while since this barn was used, on a daily basis, for what it was originally built for. If the farmed could see the condition of the wall he would probably have one or two things to say to the present owner, who probably is only using it for storage. 
A long time ago this wall would have been painted with tar, often mixed with pigment from the copper mine in Falun, in the mid-west of Sweden. The pigment was a bi-product from the mines copper production but soon became one of the main product as more and more people during the 18th century could afford the paint, especially when linseed oil was used in stead of tar as the binding material. The basic recipe is water, flour, linseed-oil and pigment. Having your house painted was a sign of wealth and status. Later, you could get it from yellow to black, but the most common color was red.
When the color with time gets bleached you only have to brush the old pigment of the wall with a brush and then put new paint on top. It lasted for years and was easy to renew. You can learn more about making the paint here. There's also a film to describe the production, but only in Swedish. It you read the text you might understand the film anyway.

In the evening I went to Kalmar on the mainland to see a concert. A concert I bought the ticket for in the autumn of 2019 when I became a pensioner. Some pandemic got in between the actual concert and it was moved three times until this evening, two years later. It was a wonderful, super professional concert, the band is called Bo Kaspers Orkester.