The scratchboard process
The following explains the process of making a scratchboard piece on clayboard, ink and sometimes watercolor.
Scratchboard is a technique invented in the 1850s. At that time artists worked on a specially coated cardboard but now most artists use clayboard, which is a hardboard coated with a fine layer of clay. You can buy it in white or black, the black being already coated with a layer of ink. I prefer to use the white in most cases because I like to preserve the white background and only cover with ink the parts of the design that I’m going to scratch. That way the white area stays clean and I can paint it with watercolor, other media, or leave it white.
1- I draw my sketch on tracing paper and transfer it to the clayboard by putting a sheet of graphite paper between the board and the tracing paper. I always rest my hand on a piece of tracing paper to prevent smudging.
2- I cover with waterproof ink only the areas that I will scratch. I might do more later but I start with the main design. If the drawing has areas that are light but not totally white, I dilute the ink and cover the surface lightly.
3- In this case I put a gray coat of ink on the tree trunk and on the white parts of the bird that I would later scratch. I also added some branches and berries and since I wanted them very light so they wouldn't compete with the main drawing. I used liquid frisket to cover those areas. It looks blue.
4- The next step is to start scratching the ink to get to the white layer. I do that very lightly with a fine knife, trying not to damage the surface. I can always come back and add pressure to show more detail. I always do the scratches following the contour of the subject, building volume and following the direction of the feathers, hair or other textures.
5- At this point I am ready to add some color. This surface is not prepared for watercolor so it won’t be even but I like to take advantage of the textures and accidents it will produce. If I’m not happy with the results I can add or take out some color with a thick brush and water, picking up or moving the color around. It looks scary but I like the challenge. After the surface is completely dry I use a rubber eraser to pick up the liquid frisket. As you can see it leaves a white area ready to be inked.
6-Finally, I use a mechanical pen with waterproof ink to draw the branches and only watercolor for the berries. I usually go back to add highlights, add some ink or do other changes before the piece is ready.
Enamels and enameling
This post was originally written for the Orange County Artists Guild, Blog in 2011
“Enameling is a dying art”. I refused to believe it! I just came back from Austria, where I expected to see and maybe buy some pieces of the most beautiful enamel work, as I remember they had many years ago. I was greatly disappointed when I could not find one piece of traditional or modern enamel anywhere in Vienna or Salzburg. I asked everywhere and nobody knew where to find it. I finally found a jeweler who told me of a small shop on the outskirts of Vienna that might have a few pieces. I never found it. The irony is that most of the enamels that I use on my work are Schauer enamels from Austria. Well, I’ll treasure the few pieces I have from Austria, France, Germany, Chile and Mexico. Maybe they still make it? But if you want to see beautiful enamel work on this country you should go to the Enamelists Gallery at the Torpedo Factory in Old Town Alexandria, Virginia. I was a member of that gallery for 10 years. I stopped working on enamels in 1994 when we moved to Chapel Hill, North Carolina. Since then I have been working on children books, botanical illustration, and many other things, but now after 16 years I’m back doing enamels, experimenting with techniques and working on mixed media. It’s exciting.
What is Enamel?
The word “enamel” refers to the glass material as well as to the finished product. Enameling is the process of applying a specially prepared glass to metal and then fusing the two together through the use of heat.
More than any other medium utilizing color, enamel is permanent. The color will not fade over time due to light, and the texture will not change or decay. Only a hard blow or fall can destroy or damage the enamel. In addition to these qualities, its gemlike surface, brilliance and richness of color and the light shining through the enamel and reflecting the metal underneath it showing depth, all contribute to the luxurious appearance of enamel work.
Enamels can be bonded to most metals, like gold, silver, copper, steel, cast iron, aluminum and titanium. The enamel becomes a veil of color between the metal and all else.
Enameling is an art form with a long and rich heritage. The Greeks were enameling gold jewelry as early as the 5th Century B.C., as did the Celtics in the 1st Century B.C. and during the Byzantine era. In the 4th through 12th Centuries, numerous enamel religious works were produced. The artisans in Limoges perfected the use of enamels in a painting technique in the 15th Century. The 17th, 18th, and 19th Centuries and the early decades of the 20th, saw production of a great volume of luxury and decorative enamels. Cloisonné has also been employed by the Japanese and Chinese since the last part of the 19th century. The use of enamels for utilitarian purposes started at the end of the 19th Century. First on pots and pans for cooking, then stoves, refrigerators, kitchen sinks, bath tubs, laundry appliances, architectural panels, etc…
Contemporary enamelists can purchase enamels in many forms. Powdered enamels can be transparent, opaque, opalescent or clear, called flux. Also painting enamels, watercolor and acrylic enamels, under glaze pencils, chalks, ceramic pigments, lumps, chips, and threads and decal papers.
Lead-free enamels are safer to use and more acid resistant. All enamels, both lead-free and lead-bearing, contain ingredients that can be hazardous when inhaled. When sifting any type of enamel, always wear a mask and fire enamels in a well-ventilated area. Here is a picture of me at my kiln, which is 9”x9” inside.
How is it done?
The enamel (glass) is crushed to a powder finer than granulated sugar and coarser than flour. This powder is applied, by one of several methods, to the metal surface and heated in a kiln at a temperature of between 1000º to 1600º F or with a hand held torch. After a few minutes the piece is removed and allowed to cool at room temperature. Several coats are applied and sometimes one piece will require 10 or more firings to bring about the desired results.
Covering both sides of the metal with enamel evenly distributes the stress of expansion and contraction.The coat on the front of the piece is called the base coat, and the coat on the back is the counter enamel. It will warp less if the counter enamel is about as thick as the base coat.
The traditional techniques include: Limoges, cloisonné, basse-taille, champlevé, grissaille, plique-a-jour and repoussé. In addition to those you can use sgraffito, stenciling, silver and gold foils and liquids, or combinations. In modern enamels you will find a variety and combination of techniques such as highfiring, copper collage, fusing glass chunks and threads, burnout, oxidation, electroplating or firescale. Any possible combination that produces the results that you are looking for is worth experimenting.
Following is a brief description of the traditional techniques. You can find much more information on the Internet.
In the Limoges or wet inlay technique, moistened enamels are applied onto a metal surface, in a thin and uniform coat using special inlay tools or a brush.
In basse-taille, a French word meaning “low cut”, the metal surface is treated extensively through a variety of techniques like etching, engraving, hammering, stamping, carving, punching or scratching. Several layers of transparent enamels are then fired over this base.
Cloisonné is from the French word cloisons, meaning “partitioned areas” or cells. In this technique the enamels are separated from each other by thin metal wires. These metal dividers form the design. The wires are fixed upright to the surface to form the cells which are then carefully filled with enamel until the color reaches the level of the wires.
In champlevé or “raised plane,” areas of the metal are etched with acid to form recessed compartments. Enamels are then wet-inlaid in the recessed areas until they are flush with the surrounding metal.
The word is from the french gris, meaning “gray”. Grissaile resembles Limoges in terms of technique, but no color is utilized. A finely ground white opaque is applied to a fired black opaque base, and designed details are scratched through or are painted on with liquid enamel. The design is established by building up successive coats of white that fuse into the black base to form a gray/white image.
The beauty of this technique is revealed in its transparency. This technique uses transparent enamels without metal backing, looking like a miniature stained-glass window. There are four methods to create plique-a-jour:
1 Pierced Plique-a-jour
2 Cloisonné wiring and acid etching
3 Cloisonné wires on mica
4 Soldered filigree
In repoussé the metal is formed from the back to produce areas of high and low relief that can become highly complex, to the point of becoming sculpture. The metal is worked with different hammers. The process of delineation is called chasing. Extremely beautiful copper pieces can be achieved with this technique.
Here is a sample of my work, which is completely non-traditional. I have made a piece and taken pictures at various stages to show some of the process. Below the pictures is a description of the process.
The completed work is seen at the top of this article.
Here’s an example of the process to make a finished piece.
This piece has at least six or seven firings. Here are some of the steps:
1 I started with two 6”x6” enameled steel plates with a white cover coat and counter enamel on the back, which I had previously enameled but that I did not like. That’s the beauty of working non-traditional--you can recycle.
2 Over those colors I sifted my design, free-hand. The colors are opaque but they will sink in the kiln and pick up some of the colors underneath. I fired them one by one at 1400ºF (see the first picture of the process above).
3 In the next step I created shapes with silver foil and I also formed round copper wires to create a loose cloisonné. I applied transparent flux and colors over all the silver, more of the background color for a heavier coat and wet enamels inside the wires (see the second picture of the process above), and after firing (see the third picture of the process above).
4 The next step was to add more color on the trees and the houses and glass lumps and threads for texture.
5 After I fired that I wanted to have more color at the bottom so I sifted some light green over the purple and placed some millefiore beads and glass threads. I also carefully applied, with a limoges technique, light blue enamel around the water creatures to create more contrast and detail, as well as some specks of glass and on the house shapes.
6 The following step was to apply the liquid gold with a fine pen over the black background and on the water creatures. The gold needs to be carefully monitored because low firing won’t turn to gold and very hot can burn it. This last firing enables the enamels to sink a little bit more onto the previous colors and blend together. I like that look and the accidents that can happen.
7 In between every firing I have to clean the oxide from the copper wires. You don’t want specks flying over your colors and also it makes it easier to clean after the piece is done.
8 The last thing is to carefully clean the wire with a copper cleaner and the finest wet sanding paper. Finally I burnish the copper for a clean look.
This is just “scratching the surface”. Enameling is a complex and demanding process that can deliver beautiful results. I hope you will have a better appreciation for this ancient and beautiful technique.
Here is the completed piece, "Night Sky and the Sea," mounted on a clay board, finished in acrylic, 10”x14.” The owners are Josh and Robin Gurlitz.