How to use "blot" in a sentence

In her unhappy state of mind, Cosette had forgotten to remove the page that she had used to blot the letter she had written to Marius

While she thought about what Elliot had said, she dipped one finger in the water and drew a grim mouth, a nose, and a pair of eyes in the circle; she added two horns, transforming the blot of moisture into a little demonic face