Remove the roll of hair colouring foil from its packaging. Open the top lid of the machine by lifting the release catch and pulling lid up. Ensure that the safety catch is engaged holding the lid in the fully open position. Insert the foil into locators inside the body of the machine - small side of the core in small locator in the machine, large side into large locator. Foil will feed forward. Pull foil forward to ensure foil is pulled taught and crease free. Approximately 5 cm's of foil must overhang from the machine lip so the sensor is covered. Close the lid.