... it is true to say that all woods change colour when exposed to UV light and become oxidised due to oxygen exposure (over extended time periods when polished), even woods that have been either dyed or, alternatively, stained. For example, antique or old furniture with much marquetry that would have been vibrantly coloured when first made, because of multiple wood choices and colouring techniques, lose these striking colour differences over decades or centuries. Mostly, all the different woods and original colours, whether natural or dyed/stained, move towards a mid-brown. Slainte.