The Scotland's People folk were marvellous. I had a legible image within 24 hours!
A bit more info, but still hitting a brick wall with James Anderson and Jane/Jean Black.
What I've found...
Jane/Jean's mother Margaret Black (McEwan) was a widow by 1851 (census) when she lived with dau Isabella (Black) & Alexander Stewart. She died in 1871 at Alloa, Clackmannanshire.
By 1861 Isabella and Alexander were living back at Alexander's home town, Brechin
Not sure when father John Black died, as I got 74 hits on Scotland's People, and none that seemed 'obvious'. Not a one in Clackmannanshire.
Margaret Black (McEwan) was the daughter of Marion McEwan (Anderson!) I think d. in 1866 in Alloa, Clackmannan (of 'Old Age' at 79), and husband William McEwan I think d. 1861 in Clackmannan, age 61, mother's maiden name McLaren. Will need to get more credits and the certs next payday.
There's also a death for Margaret Black age 47 in 1866 at Alloa... no idea if she's related.
I cannot find deaths for either Jean/Jane Anderson (Black) or her husband James. It's like aliens took them. I'm communicating with another (distant) family member and she's had no luck either.

She also has their marriage as 1838 at Alloa, Clackmannanshire, so we agree that's them.
Poor old Jean/Jane doesn't seem to exist in the 'Black' family, yet everything else fits.
Jenn