Roberts video #3 - reposted in horizontal mode. 1st of 4 inspection videos today. This video shows the initial condition of the boiler interior. Although there is not a lot of mineral buildup, there is a blue tint. That is caused by a direct consequence of the mild corrosive attack of airborne sulfur compounds with copper (in the brass) . We can easily remove this with a proper descale.

Here's a discussion about why copper roofs turn blue:
https://momentum.providence.edu/all-c...

Follow the complete series here (uncut/unedited - mostly): https://tinyurl.com/Roberts-1982-LaPa...