I think the product Xeon is trying to remember is ``Back2Natural`` ... if you use this from the word ` go`, it will help prevent the reddish tones appearing..... it`s not as /so effective once that colour -issue becomes obvious..... it`s a case of ` prevention is better than cure`. If /when the red tones appear, you`ll have to then use one of the ` normal` colouring products available in Pharmacies etc.
You can just Google ``Back2Natural`` and you`ll find suppliers.