Dip the dried white hydrangea flower heads in a bath of acetone.

Drop a few drops of the gourd dye onto the petals.

Dip your paintbrush into the acetone and then spread the dye on the petals until you get the peak color you are looking for. 

Continue this process until you have a perfect hued bloom of your choice.

Place the dry flowers into a piece of styrofoam for a few hours.  

Once the flowers are dry, spray them with hairspray. Dried flowers become brittle and delicate. Hairspray can help stiffen the petals slightly, reducing the chance of them breaking off and creating a mess.