On Mon, 27 Jan 2020 10:52:14 -0800, Jeff Liebermann
wrote:

Mo
https://www.metcheck.co.uk/collections/barograph-pens-and-ink
http://www.fountainpennetwork.com/forum/topic/47798-chart-recorder-ink-options/
https://www.ebay.com/itm/Barograph-Thermograph-Recording-Ink-Slow-Dry-Dark-Blue-5oz-15ml-/123902459872
https://www.worthpoint.com/worthopedia/barograph-instrument-recording-pen-276775650
etc...

More of the same:
https://www.ebay.com/sch/i.html?_nkw=recording+instrument+ink
https://www.ebay.com/sch/i.html?_nkw=barograph+recording+ink+slow+dry
https://www.ebay.com/itm/ink-Universal-Bristols-Recorder-Ink-Waterbury-CT-Recording-Instrument-Ink/392645088431
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558