Size A3: 11.7" x 18.5"
Calambour is based in Milan Italy and is owned by a mother and daughter team. They have been teaching the art of decoupage for many years to students all over the world. The designs are very classic and beautiful. 
For Best Results:
Paint the surface with a light or white colored background so the image will show against the transparency of the paper. 
Apply a layer of decoupage medium to the surface, then place the paper. If you are covering a large area, it is best to do it a section at a time.
Once the paper is positioned correctly, apply another layer of glue over the top.
Let top layer fully dry before applying a second coat of decoupage medium or varnish.
Do not touch your rice paper when it is wet.
Use a soft brush with flat / wide bristles (golden taklon works well).