In order to achieve both strength and invisibility in textile conservation treatments, sheer plain weave or net fabrics of nylon, polyester, or silk are often employed. Stabiltex, the most stable sheer fabric, is only available in a limited solid color range, thereby restricting its utilization for the treatment of textiles. Dyeing methods for coloring this polyester fabric were not conducive to laboratory work until the development of thermofixation, now used industrially. This presentation will discuss two methods of thermofixation as a way of achieving a broad colorway and infinite design range on polyester fabrics needed in a textile conservation laboratory. The thermosol method will be recommended for larger quantities of fabric because the dye is padded onto the fabric before the heat treatment. For unique designs or odd shapes, the heat-transfer process would be used. Disperse dye is painted or printed on a release paper, then transferred to the fabric under heat.