Catechol developer works slowly and with hard contrast. It an be used as the first developer in a two-bath developing process. Develop in Catechol until the shadow areas can be clearly seen. Then develop in the second bath until the desired highlight detail is reached. The shadow density will be increased and clearly defined, and the image tone will be pushed into cooler nuances. Increases the Dmax with warmtone papers and with warmtone developer as the second bath.
1 Liter concentrate. Dilution 1+7 ti 1+9