These flowers aren’t paint or pixels—they’re a collaboration with the solar. What you see are the shadows of lots of of actual wildflowers as they blocked eight minutes of daylight from photosensitive iron salts: ferric ammonium oxalate and potassium ferricyanide, to be precise.
The method, cyanotype, was invented in 1842 and is extra generally used on paper or textiles. Earlier than digitization, this was a strategy to quickly replicate prints from negatives, together with architectural plans, or “blue prints.” In brief, you paint a substrate with chemical compounds, lay down a masks, expose the piece to UV gentle, then rinse it with water. Any light-activated resolution binds to the substrate in an attractive cyan blue, and the non-activated resolution washes away. This two-part cyanotype resolution could be bought at most artwork shops.
Printing on wooden
There are various sources on easy methods to print with cyanotype on paper and textiles, however few on easy methods to strategy wooden. I discovered that a lot of the wood-specific prep has much less to do with the print publicity itself and extra with the rinsing after. Hardly ever can we as woodworkers submerge or run water over our completed initiatives for a number of minutes.
Addressing wood-movement considerations
Let’s return to fundamentals: Wooden strikes when moist. Plan for this with a post-rinse flattening technique. Masks the tip grain and unprinted areas with tape and plastic luggage the place potential, use water resistant glue, and usually depart your self wiggle room for potential warping. Since I glued up my cupboard earlier than the cyanotype, some seams opened and my door warped, so I had to return and refit it to the case.
Increase the grain earlier than you start
One other tough factor is that each water-based options and a water tub will elevate the grain. You can’t sand closely after the cyanotype course of with out scrubbing away your print. To organize, I evenly moist the floor of the wooden and sanded a number of occasions over as soon as it had dried. This raised after which smoothed the wooden floor earlier than I painted it with the answer. I sanded as much as 220 grit.
Wooden shade
As a result of the sweetness and element of cyanotype depends on monochromatic distinction, I initially thought to whiten the wooden not directly, however a lot of the whiteners I attempted resisted the water-based cyanotype resolution. In the long run, birch’s pure gentle shade labored simply effective. I really like how one can see the wooden grain by means of the ultimate print—one thing to contemplate when selecting wooden and inserting your masks. By its nature, the cyanotype course of will all the time flip the bottom materials a vibrant Prussian blue.
Making the masks
The chances are really countless right here, from digital print on acetate to holding your hand over the piece because it exposes, a masks could be something that casts a shadow. Shut contact between the masks and the substrate yields the crispest edges, so I flattened my flowers in a easy press for every week beforehand.
In the event you’re working with a picture that’s simple to position within the close to darkish and on a flat floor, you possibly can merely lay a sheet of glass over your masks to carry it in place. As my floor was curved and my design advanced, I labored within the daylight, sticking my flowers to a packing-tape “pores and skin” of my 3D form, then wrapped my cupboard in the dead of night.
Making use of the answer
For essentially the most half, you possibly can comply with the identical directions as for software on paper or material:
- Combine the two-part resolution in keeping with the product directions.
- Apply the answer to your substrate utilizing a foam brush.
- Anticipate the answer to dry fully in a darkish room. You do not need to show it to UV gentle but.
- As soon as dried, place your masks onto the substrate and convey it exterior for UV publicity.
I used to be beneficiant with the cyanotype resolution and didn’t discover any profit to a number of coats. The answer ought to seem a sickly inexperienced while you unfold it, darkening very barely because it dries. If it’s already blue, it has activated, so be sure to’re working in a really low-UV atmosphere. A profit to doing this system on wooden is which you can sand it again and begin over!
Let there be gentle!
How a lot gentle? How a lot time?
The reply is testing, testing, testing. As a result of you possibly can’t simply pull one other piece of paper from the pack or use extra an identical material out of your stash, you’ll need to check your course of on wooden that’s sanded and formed equally to your closing undertaking. For my checks, I used the solar, a strip check for timing, and the UV index function on my cellphone’s climate app. Writing the UV index and publicity time in your check items will allow you to dial in the best mixture in your completed piece.
Rinse
Any remaining resolution on or within the wooden will proceed to activate and switch blue, so it’s time to take away the masks and rinse (not scrub!) in chilly water till it runs clear. It’s a fairly magical second.
As a result of wooden is darker when moist, you’ll see the distinction enhance because it dries.
Optionally, end your rinse with some water with 3% hydrogen peroxide in it. That accelerates the oxidization course of and offers you the moment gratification of a deep cyan blue. It occurs naturally over a number of days, however I most well-liked to search out out sooner whether or not or not my print had labored.
End
After the piece was uncovered, rinsed, and dried, I knocked off the remaining wooden grain hairiness with a brown paper bag. Evenly buffing on this style additionally saved the answer from soaking in too far, the place it may not have rinsed out. That may have prompted it to proceed to activate (flip blue) after the masks was eliminated.
I didn’t experiment very a lot on the ending entrance, however I knew I wished to keep away from introducing any yellowing, so oil was out of the query. In the long run, I merely buffed the floor with paste wax to provide it some glow. As I perceive it, the blue shade is now lightfast, although UV gentle will proceed to affect wooden because it ever does, darkening gentle woods and lightening darkish ones.
In the event you attempt cyanotype on wooden, I hope you’ll let me know within the feedback! With so many variables, I’ve little doubt you’ll have discovered one thing new to share about this distinctive ending course of.
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