What you’ll need:

1. Fallen leaf or leaves
2. Small bowl
3. paper towels
4. Food colouring (optional)
5. Stiff paint brush
6. Household bleach

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Clean the leaf thoroughly to remove dirt. Soak it in a strong solution of bleach till it turns white. Caution: Strong household bleach is corrosive. Please avoid direct contact with your fingers or skin.

Rinse the leaf and gently remove the soft tissue with a paint brush.

Rinse and blot dry between paper towels.

Optional: Pour the food colouring of your choice into a small basin. Dip the leaf skeleton in it. Remove and dry between paper towels.

Source