Sunday, March 24, 2013

Liver of Sulfur Patina

That great antiqued look that really gives textured metal a sense of depth often comes from a simple (and super quick) patina of Liver of Sulfur.  Liver of Sulfur comes in dry lump form and gel form.  The dry lump form has a shorter shelf life, impacted by light and moisture, though kept in light proof and dry conditions I have had no problem with it working long term.  Below are images of my use of Liver of Sulfur to patina some recent pieces, obviously you should follow the directions that come with the brand you purchase, but you can get an idea of the process and results from the below post.

I tend to use glass bowls when working with different chemicals in order to reduce the potential for reaction and ensure they are able to be cleaned when done.  Remember, once something has been used in the art studio, it should never go back to the kitchen for food use. Liver of Sulfur should be used in a well ventilated area because it stinks (like sulfur).  Either your Liver of Sulfur solution or the metal should be hot in order to improve the reaction.  Depending on how strong you mix the solution, metal in the general area (like rings on the hand mixing the solution) can react to it in the air, so consider removing your own jewelry before you begin.  

I dissolved a small lump (a very small pea-sized piece) of Liver of Sulfur in about a cup of very hot (not boiling) water in a glass dish.  In the dish next to it I had cold water and Baking Soda to serve as a stop-bath.  I ran yarn through the bails to keep my fingers clean, dropped each piece in, it only takes seconds to get a rich black, pulled them out and dropped them in the stop-bath.  Liver of Sulfur has a wonderful range of iridescent blue to deepest black, so if you watch it close you can pull the piece out and stop the reaction at the exact color you are looking for.  After a quick dip in the stop-bath, they are rinsed, dried and ready to be finished.

Above, you can see that the pieces have a rich black patina, so it is time to start bringing back the highlights to show all the depth in the texture.  I prefer to use very fine steel wool to buff the raised areas of the piece.  Below you can see a finished piece with more defined texture and antiqued look.  Remember to follow the recommendations on the package for disposal of Liver of Sulfur solution once you are finished with it.  The best part is that if you are unhappy with it, you can toss the piece back in the tumbler (or go at it with any variety of buffing/sanding tools) and strip the patina off to start again.


Sunday, March 10, 2013

Barrel Bails

I recently spent some time playing with designs for barrel shaped bails that would sit behind and on top of small geometric pendants I had been creating.  They were all part of a small series that I wanted to keep unified, so I needed a versatile design that would fit the varying shapes, while staying visually cohesive.  For these pieces, I began by rolling out a sheet of metal clay 3 cards thick.  I cut it into a long rectangle, wrapped it around a straw I had rubbed with olive oil and sealed it's seam.  I let it stiffen up for just a few minutes before beginning to slice it on the straw.  I held my knife in place and rolled the straw to get an even cut.  I then spaced out each of the pieces and set them to dry in place on the straw.  Once they were bone dry, I gently slid them off and sanded them before attaching them to my dried pendants with slip.  Starting with the longer piece and cutting it apart allowed me to make several pieces at once and vary their sizes to fit the individual pendants they would be attached to.  It was important to cut them on the straw in order for the clay to stay supported and not collapse under the pressure of the knife due to its hollow center.