The are relatively few pre-Proscription artefacts surviving but of those that do all those that I've examined that include red and blue (about 99% of them) were dyed with cochineal/lac (generally the former) and indigo respectively all of which were imported natural dyestuffs. Note, cochineal and lac are insect and not vegetable dyes.
As most native dye plants are fairly widespread there is little possibility of localising the colours. The exception to this would be some the lichen dyes known in Gaelic as 'crotal' and in particular 'dark crotal' Parmelia cetarophilia which only grows on the west coast and was traditionally used in Harris Tweed to give that lovely ginger colour and fantastic aromatic smokey small.
The chief would have had nothing to do with the design of a tartan any more than he would the design of a jacket, sporran, sword etc etc. Like everyone else he would have obtained his cloth either locally of further afield based on what was available, what he liked and could afford.













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