It works by creating a greasy image on foil, which is then etched with acidic cola and inked up, allowing the drawn image to grab ink, repel water to be transferred to paper.
What to bring
Apron
Thick cartridge paper, or some small change to buy some from the school.
Kitchen roll or cotton rags
Wooden spoon
Sponge. (The best one to get is a Spontex Handy Sponge.)
A permanent marker like a Sharpie.
Parking is available in front of the school in the school car park, on the street and in the village hall car park nearby. Complimentary refreshments are available throughout the day. Please bring a packed lunch.