I tested the erasable carbon paper from CopyRite.
Transfer of a drawing onto watercolour paper.
Very good results : Does not stain the paper. Lines can be erased without leaving any marks. Perfect for transferring properly without being afraid of getting the paper dirty. It can also be used to transfer a design onto canvas or fabric. Several colours of carbon are available : black, blue, red, yellow and white which is convenient for transferring on a medium of any colour.
This erasable carbon paper is now distributed in Germany under the brand AMI