Step 2: How to make an Impression

I covered the back of several leaves I collected with a generous coating of mineral oil.

The back veins are deeper on the leaves than the front and are perfect for casting.

Roll out a piece of clay that is larger than your object for casting.  Here I rolled the playdough onto baking paper and pressed it flat with a piece of plastic wrap.

I then pressed the leaves into the sticky playdough.