The surfaces are treated with oil in many layers and is sanded between the coats. As standard the birch is treated with a white pigmented oil and the oak with just a plain oil. As for paint we use egg-oil tempera.
We use linseed based oil when treating our wooden furniture. They take a long time to dry but gives a beautiful and long lasting result. After the first coat has been applied the piece is allowed to dry for 24 hours. The surface is then sanded before a second layer is applied which dries to give a velvet smooth surface.
When a painted surface is requred we use egg-oil tempera. That is a natural paint with a long tradition that gives a beautiful and long lasting surface to your furniture. It gives a very matt finish but can result in a egg shell like gloss if rubbed with a brush after the paint has been allowed to dry two, three weeks. Completely hardened after four weeks but becomes harder after the first six months.