Enzyme Washing is the use of cellulose enzymes to soften the jeans and lighten a colour. The cellulosic used because they loosen up the indigo dye in the denim.
Green cast denim is when a yellow-green sulphuric is used in the indigo dye.
Oxidation when oxygen and another substance chemically join; it occurs when the indigo yarn comes out of the indigo bath between dips and is critical for the dyestuff to penetrate the fibre.
Range-dyeing is a process in which yarn runs through an indigo dye, then the colour fix by exposing it to air. This allows the fabric to fade gradually.
Textile Dye diagram with links to all related terms in the Eco-Fashion Encyclopedia