Elsa Beskow colouring book has large colouring areas, therefore particularly well suited for Seccorell fingerwipe colouring.
Very relaxing, especially for adults. The attached example picture was created exclusively with the 8 primary colours.
Brown and grey were mixed. It is advisable to rub the colours in (e.g. on a piece of paper) and then pick them up with your finger or a cotton bud.
Of course you can colour your books with pencils or crayons too!