The hardware has been modified to “print” up to the full six feet in length (actually a little more, maybe 6’8″). I continue to crank out test prints, with about a 50/40/10 mix of “awesome”/”disappointing”/”dismal.” Now it seems the production part of the project is largely dialed in; it seems that *chemistry* is responsible for much of the trouble. There is a window in which the fluid can be properly used:

1. When the two chemicals are first mixed, they produce a liquid that is mud-brown. When used right off, it doesn’t seem to stick to the paper very well, or doesn’t react adequately. In any event, the result is massively faded. Wholly unusable. It seems to take about 24 hours from mixing to reliable usability. After 24 hours, the fluid has turned from brown to dark-ish green. Seems to work great at about that point. After another day, it turns a *dark* green, then trends towards blue. As it goes, it becomes increasingly useless. So there is a 24-48 hour window, it seems. I can work with that, now that I got it more or less figgered.

While the hardware is set up for in excess of 6 feet, so far the biggest print I’ve done is 56 inches, a *spectacular* pair of isometric interior structure views of the B-2A. yeah, I’m a bit surprised that the original was declassified, but it was, so there it is (and it was sent to me by a Russian feller, so it’s out there). I’ve done 2 so far… one is as close to perfect as I can hope for; one is *slightly* flawed via faded bits.

When I left Utah, my cyanotyping hardware got trashed. But I had the foresight to roll up all the transparencies I had. And wow, I have a lot of them. And WOW are they dirty. Utah is great and all, but it *is* the desert and full of dust… it’s coarse, rough, irritating, and it gets everywhere. All of the transparencies will have to be washed and windexed. And I’ve washed, but not yet windexed, the first of the six-footers I plan on printing: a CAD diagram of my own, the SLS in 1/72 scale. A good businessman would have had this ready for the Artemis mission a little while ago but… shrug.

These test prints will probably go up on ebay to get some sense of the interest in them. I suspect an Etsy store would be the best next step. There are a *lot* of crappy digitally printed aerospace “blueprints” there… one of the very first ones to pop up is a digitally printed 12″x72″ Saturn V that almost certainly was derived from Space Drawing 4.  I previously sold actual cyanotypes of this at the exact same size… for $50 compared to the digital print at $75. I feel rather like a chump. There are actual cyanotype prints available as well, but the one’s I’ve seen all look rather bland and low-effort. Bah.