**2.3 Equipment**

Two types of laboratory machines with different methods of liquor circulation were used to dye samples of wool fabric. The details are described below.

*Ahiba Turbomat.* 

Fabric samples were wound onto perforated spindles. The dyebaths were circulated by pumping the liquor through the fabric tube (in to out).

*Mathis Labomat* 

With this machine, the fabric samples and dye liquors were sealed inside pots. Circulation was achieved by tumbling the pots inside a heated box. This resulted in both fabric and liquor moving together. As the pots were not completely filled with liquor, the air in the pot was mixed with the liquor.
