In general Suhl did a good job of recording the painting, but there are many small deviations and errors, which is a good help when determining whether later reproductions of the painting are independent witnesses or are based on Suhl (several examples at the bottom of this page).

Make this lower case.
in general suhl did a good job of recording the painting, but there are many small deviations and errors, which is a good help when determining whether later reproductions of the painting are independent witnesses or are based on suhl (several examples at the bottom of this page).