if by 'the blog' you (or you and kennyblanken) mean https://chemisting.com/, which post do you mean? the post you link to in that blog doesn't say anything about coulombic efficiency or inkjet paper, and there are four years of posts in the blog
Re:An open-source flow battery kit
by jerrysievert on Thursday August 15, 2024 @06:22PM
(#41261095)
https://www.amazon.com/Kodak-photo-paper-matte-count/dp/B0B5... according to the link.
the blog is listed in the first paragraph of the linked article: https://chemisting.com/2024/03/15/an-open-source-diy-flow-ba...