Fulachta fiadh would have been ideal for this purpose. Co. Kerry places the site well into the context discussed above. Fulachta fiadh may also have been used for dyeing material. You do not need much to be successful at dyeing. We know that dyeing was practised in Britain and Northern Europe at a very early date so there is nothing to say it did not go on in Ireland.
Dyestuffs are easy to attain.
Basically anything that when boiled, releases colour can be used as a dye. Most leaves from plants, barks from trees, berries from bushes and even some soils produce a dye when boiled. So if the bark from a tree or the leaves of a bush fell into a pot of boiling water and coloured it, the realisation that they could be used for dyeing could have came about. When dyestuff is being prepared it is crushed, kneaded and finally fermented in cold water. When the dye process was finished the material was hung out to dry.