NOTES ON THE TECHNIQUE OF TIBETAN THANGKAS
2 MATERIALS AND TECHNIQUES
THE ART OF THANGKA painting is transmitted from master to student through an apprenticeship system, and a student works with a master for many years to learn style and technique. Thangka painting is strongly regional in character, and both style and technique are determined by the place of origin. The mountings also differ in style according to region and subject matter. Western art historians, beginning with Giuseppe Tucci, have focused on the style of Central Tibet. This style generally presents an effect of heavier paint layers and less subtle blending of colors than the more Eastern styles. Most of the research presented in this paper, however, documents the New Menri (17th century) and Karma Gardri (16th century) styles of Eastern Tibet.
2.1 Support and Ground
The thangka support is generally cotton which is prepared with a ground, and upon which the painting is done before being sewn into the mounting. In the Eastern school of thangka painting, the supports were imported from India or China, because the fine-quality cloth required for smooth surfaces was not woven in Eastern Tibet. Cotton is the most common support for thangka paintings; silk is more often used for embroidered picture panels.3
Traditionally, Tibetan master painters often did not prepare their own supports: assistants specialized in stretching supports and preparing the ground for thangka paintings. The two most common methods of stretching the support are to lace it to a strainer or to wrap it on dowels which are laced to the strainer.
Yak-hide glue was most frequently used to prepare the ground of a painting. Prepared through a long process, the most refined parts of the glue were used for the ground. Because it is water-soluble, yak glue renders the finished painting vulnerable to water damage.
The author has seen several thangka picture panels that were removed from their cloth mountings and relined onto paper or cloth supports with the use of water-soluble adhesives. This resulted in water damage from behind: the ground and paint layers sunk into the support, and the numerous paint layers lost their subtlety as they sank into one another.
The color of the ground is dependent upon the taste of the artist and the materials used. Lime and chalk are the two most commonly used grounds in thangka paintings. Black, red or gold grounds were used for thangkas done in a specific style in which the ground colors related to the iconography portrayed. Some thangkas of recent manufacture have grounds that have been tinted brown to make the thangkas appear old.
In the style of Eastern Tibet, the ground is applied directly to the support with no preliminary sizing. For example, a ground mixture of lime, hide glue and water may be mixed together in a bowl. A cotton cloth or natural sponge is allowed to soak in the ground mixture, which has the consistency of buttermilk. Then the mixture is rubbed onto both sides of the support; it is vigorously worked into the support with the hands, and the support is then placed in the sun to dry. Many coats of ground may be applied in this manner. Finally, the ground is polished with a stone or shell, and water is sometimes added with a damp cloth to smooth the surface. Polishing is a delicate, lengthy, and important process.4
In Khams, a province in Eastern Tibet, as many as twelve artists might work together on several paintings at a time, the supports having been prepared by their assistants. The painting then proceeds according to traditional steps.
2.2 Measurement and Layout of Canvas
The first step is the thig tse, the measurement and layout of the figures and composition. A thig kü, or thread, is covered with colored chalk and strung onto the strainer at measured intervals. With the end held tightly, it is snapped against the canvas to make lines that establish the proportions of the painting: the figures, their location on the field, the border of the painted area, and the sections of the background.
2.3 Charcoal Sketch
Next, the kya ri, a rough charcoal sketch, is drawn on the ground. Guided by the thig tse marks, the master artist sketches the major outlines of the main figures; the entourage and background are often drawn with a bare minimum of measures. Then the sketch is examined and corrections may be made. Indigo or carbon ink is then used over the charcoal sketch to delineate the areas for painting. Another method commonly used by artists today is to trace woodblock prints, or shing par onto the prepared ground to outline standard iconographies.
2.4 Application of Flat Colors
The application of flat colors is called leb tsön in Tibetan. Generally; a thangka is painted in stages: first, the sky is painted, then the background, then the earth, or foreground. The figure painting progresses by order of color: first, dark blue is applied wherever it is needed in the design. This is due to the working properties of azurite, the usual dark blue pigment, which tends to smudge and require burnishing. Light blue (a finer grind of azurite) is then applied, then green (malachite), light green (a finer grind of malachite), light orange (minium), then pink. (Some colors, including pink, are produced both from mixing pigments and from organic dyes from plants.) Then, deep orange (minium), red (vermillion), yellow (orpiment), and skin colors are applied. White and gold are the last flat colors to be laid down.5
In the Eastern Tibetan style of painting, a color will be applied at least three times; while in the Central Tibetan style, one thicker coat is applied. The damage to paint layers (resulting from the technique of their application) of Eastern style paintings appears as the loss of one or several of the finely applied paint layers; while the damage to Central style paintings usually appears as deep cracking through the one thick layer.
After the flat colors have been laid down, line drawing, or ri mo, is applied to the edges of forms. This is usually done with the two main organic dye colors, indigo and brownish red lac. These colors are used instead of black, which is used to color the hair of the figures: to outline other forms in black is considered cheap and hasty. The ri mo may, however, be done in darker shades of the color being outlined.
Then shading, or dang, is done. It is described in Tibetan as the “falling of darkness, [like] an even and gradual change over the mountains…”6
There are two methods of shading, wet and dry. Dry shading, in its finest form, is done with a very dry, fine-pointed brush. Each stroke or dot applies a very small amount of pigment. It takes a very long time to build up any intensity of color, and gradations are achieved by the spacing of the delicate strokes or dots. Dry shading can be applied directly over a flat color or directly over the ground; it can also be combined with wet shading.
Wet shading is done by blurring together two pools of wet pigment with a third brush bearing no color. This can be done with organic dyes as well.
2.7 Gold Ornamentation
The next step is called ser ri, or the application of gold ornamentation. Fine gold lines are painted on representations of brocade robes and cushions, and on flowers, leaves and rocks. (This stage should be distinguished from the application of flat gold areas, which is done as the last of the flat color applications.) Finally, both the flat gold areas and the gold lines are polished with a gem stone, such as onyx. After polishing of the golds, which is called ser ur, the painting is cut off the strainer and sewn onto its silk frame, or mounting. Traditionally a tailor would sew the frame.
Photograph of a thangka painted and mounted in traditional Khams regional style by the master painter Khams-trul Pinpoche. The dark background of the painting relates to the iconography of the subject matter.
Mountings are often made of silk imported from China, India, and more recently, Japan. For two reasons: the iconographical requirement of “rainbows” (silk borders sewn around the picture panel), and financial limitations, mountings are pieced together from fabrics of different weaves and weights, which causes strain on the weaker fabrics. Additional strain is caused by the structure of the thangka. Common points of wear are these: the top corners where the dowels often tear through the mounting; and the top edge of the mounting and cover, both of which are weakened by the weight hanging from them. The “door” panel, an iconographical element, is another weak area. This panel is often cut from a Ch'ing Dynasty court robe, showing a dragon or other design element. Because of their age and previous usage, these panels tend to be weaker than the surrounding silks, and they often contain gold-covered paper threads that require special care. Often all of the silk elements of the mounting are quite dessicated and fragile.
Only in recent times have painting panels been sewn into their mountings with sewing machines. Before the use of machines, cotton thread was usually used to stitch through the painting, the cording and the mounting. These stitches were quite tight and held the painting panel firmly in the mounting. As explained above, this tension often caused damage to the support.
The mountings are lined with a separate fabric, usually cotton chintz or plainweave silk. The conservator often finds these linings to be quite loose, as gravity stretches the fabric, which is still securely held to the outside edges of the mounting.
Often, a tailor has sewn a mounting over an edge or corner of a painting. When the mounting is removed for conservation treatment, it may reveal the protected original painting, with a clean surface, free from incense and butter lamp smoke damage.
2.9 “Opening of the Eyes”
Finally, there is a consecration (rab ne) ceremony for the finished thangka which includes a cen je, or “Opening of the Eyes,” ceremony. This is a religious ceremony, traditionally done by a monk or a religious teacher, which sometimes involves the writing of an inscription on the back of the thangka. Only after the performance of this ceremony is the living presence of the thangka considered to be embodied in the work and communicated by it.