The museum's new acquisition was initially believed to be a minor work from an unknown regional painter. ______, conservators cleaning the…

The second sentence reveals information that overturns the initial belief stated in the first sentence, a hidden signature revealing major authorship where minor, anonymous work was assumed. Surprisingly correctly signals that this discovery ran contrary to expectation. In addition would frame the discovery as a supplementary fact instead of a reversal of the initial belief. Similarly would suggest agreement between the two sentences, but a minor unknown work and a major artist's early piece are opposite conclusions. Consequently would incorrectly suggest the discovery resulted from the initial belief, when it actually overturned that belief instead.