This caused some unevenness in dye absorption and colour shade. Although the results were acceptable on the whole, we were not very satisfied. Then about four years ago we hit upon the idea of wrapping electric blankets around recycled 100 litre tanks and covering these with insulation sheets. These blankets keep the dye bath uniformly warm and produce dyed yarn of excellent quality. Also, as the blankets consume very little electricity, and there is no heat loss from the tank, the system is highly energy efficient. We have about 10 tanks, one for each dye, and we use the same dye bath for many months. As we don’t replace dye baths frequently, this saves a lot of water. On the whole we are very satisfied with our new system. It is simple, resource-efficient, and produces dyed yarn of excellent quality.