Dyes fibre reactive- the molecules of fibre reactive dyes actually react and bond to the fibre molecules. These dyes are the best quality and most ecologically sound synthetic dyes available.
Fixation is a term used to describe the formation of a sort of final bond between the fibre and dye. The bond type formed changes to the kind of colour and the thread.
Rope dyed is the term used to describe a way of dye indigo and considered the best possible method to dye indigo yarn.
Textile Dye diagram with links to all related terms in the Eco-Fashion Encyclopedia