During her career Colwell worked in advertising, and she was known for her hand-lettered newspaper advertisements. In 1909 she published a book of poetry,
Songs and Sonnets, which she designed and illustrated herself; she published other such books during her career. 1910 saw the publication of the volume
On the Making of Wood-Block-Color Prints. For
American Type Founders Colwell designed the 1916
display typeface Colwell Handletter and its italic. A 1947 exhibition on the history of type design in American noted her place as the only American female type designer known at that time. She was associated with the
Works Progress Administration during the 1930s; Several other works are in the collection of the
Fine Arts Museums of San Francisco. Colwell exhibited widely throughout her career, and was a member of the
Chicago Society of Artists and the Chicago and New York Societies of Etchers. ==References==