How can I preserve the beauty of dry hydrangea leaves for a longer period of time?

To preserve the beauty of dry hydrangea leaves for a longer period of time, you can carefully remove any dust or debris by gently wiping them with a soft cloth. Then, you can spray the leaves with a clear acrylic sealer to help protect them from fading or deteriorating. Finally, store the leaves in a cool, dry place away from direct sunlight to maintain their color and shape.