In an effort to insure that nothing was lost or confused in translation, the formulas given here were tested on a wide range of alloys. These pages show some of our results.
It is important to understand that many variables will affect patina results. Our tests were made on smooth, rolled metal. Textures will change the color, and cast metal has a different structure that can also influence color. These samples include no solder, and because solder is a different alloy, it will react to the solutions differently. Changes in temperature, length of exposure, climate, and strength of the chemicals wilt all influence colors.
Experiments like this are the best way to develop an understanding of the solutions that will prepare you to apply the patinas on your finished work. We recommend making tests on small pieces like this before you mix up large quantities of patina solutions or devote a lot of time coloring a large piece.
Testing Japanese Patina Solutions | |
 | Niage on CopperThe metal was cleaned with pumice, rinsed in water, and allowed to sit in grated daikon radish. The niage solution was heated to just below boiling, and the work was immersed for about 30 minutes. |
 | Niage on Red BrassThis sample was handled exactly as described above; cleaned, rinsed, and immersed in simmering solution for a half hour. |
 | Niage on Shaku-doThis piece was given the same treatment as the others on this page: clean, rinse, warm in solution for about a half hour. |
 | Niage on Shihu-ichiThe metal was cleaned with pumice, rinsed, and laid into daikon pulp. It was then suspended in simmering niage solution for about 30 minutes. |
 | Niage on Yellow BrassThis piece was handled the same as the one above, also immersed in hot niage for about a half hour. |
 | Ohaguro on Red BrassThe upper portion was given a foundation of su-tanpan, and the lower half has a niage layer. The metal was warmed with a torch and the ohahuro solution was brushed on, drying as it touched. |
 | Ohaguro on Shaku-doAll the samples on this page haw a base of su-tanpan patina; die lower half has niage. In this case, the metal was heated, then ohaguro was brushed on so it dried on contact. Five layers were applied. |
 | Ohaguro on Shihu-ichiAs above, the metal was heated to the point where the ohaguro solution spritzed and dried on contact. Again, five layers were applied. |
 | Ryusando on Shaku-doIn this case no heat was used. The ryusando solution was brushed on at room temperature and allowed to dry naturally. Five layers were applied. The top half has a su-tan-pan foundation and the lower half has a niage foundation. |
 | Su-tanpan on CopperThe samples on these two pages were handled in the same manner. After cleaning with pumice, the tiles were covered with daikon mash, then warmed in the relevant solutions for about a half hour. |
 | Su-tanpan on Red BrassAs above. The subtle color has the appearance of leather. |
 | Su-tanpan on Shaku-doThis was the darkest color of the combinations of recipe and alloy that we tested. |
 | Su-tanpan on SterlingThis subtle color has elements of red and amber. |
 | Su-tanpan on Yellow BrassThis color is a rich brown, similar, perhaps, to the color of an acorn. |
 | Kin-furubi on SterlingThis patina is gray infused with deep reds. |
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