1. Paint the inside of the tin with black acrylic paint.
2. Cut out a 1x1cm square hole in the side of the tin with a craft knife. Then cut a square piece of foil out and then using a piece of sandpaper scratch the surface of it so it is less reflective.
3. Once the surface is scratched colour in with a black marker pen and make a pinhole in the middle.
4. Finally stick the piece of foil with the black side facing in wards over the square hole in the tin using black tape.
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