I have a modern etching and it is signed twice with initials only. Inside a small square within the art are the initials BMM. One is in the black ink and the second is a red square with the initials BMM. Any help appreciated.

Hi
You should provide an image of the work and the "signature" for your question. Otherwise, only an uninformed response can be provided. Use Google image and try searching "Blanche McManus Mansfield" to see if your work resembles hers.

Good luck.