Yes, there is such a thing. My ancient Maryland ancestor was still trying to prove his service in the Continental Line when he died in Massachusetts in 1854, for example. If you have a picture of James Hudson of Wareham, please let Maureen (and me) know. Since 3rd MA Heavies is a picture-oriented site, I'm guessing that many of you, like me, enjoy looking for the oldest photos you can find of your ancestors. Maybe some of you have more than I do from the 1800s (four). Author Maureen Taylor, who has published two collections of photos of "the Revolutionary War generation" is asking for your help with volume 3 of The Last Muster (Kent State University Press, 2010 & 2013). She is trying to find pictures from each of the 13 colonies, of men and women, of free folk and slaves, in other words a variety of people who were eyewitnesses to the creation of the United States of America as children or adults. You can find out more on Maureen Taylor's website. If any of you are fans of Dr. Who and/or the "All your fandom. All in one place" website/blog whyruntothetardis.com, you will want to check out Taylor's first volume, pages 88 & 89. Look at the man in the picture, then read his writeup all the way through to the end.
The July 18 edition of the Weekly Genealogist that the NEHGS emails to members had a link to a Science News article on using particle accelerators to restore completely unreadable, tarnished daguerrotypes. Here is a link to the actual journal article in Scientific Reports, published June 22nd. It shows the before and after pictures and has the scientific details about how the process worked. These were images from the National Gallery of Canada. There is also a downloadable at the very end, labeled "Supplementary Material," with a little bit more. No word on when or if this is something other curators of photography exhibits would be able to access and restore these images from the 1840s-1860s.