Madder, which comes from the roots of several plants and trees, is one of the oldest dyes known. It can produce a number of different colours depending on the dyeing conditions. To produce a deep Turkey red it needs hard water and care that the temperature doesn't go above 160F.
My water is alkaline to begin with and I added a Tum's tablet to make it even more so. I watched the temperature but it did get up to around 180F. I still got a lovely deep Turkey red on the wool roving. The fabric is mainly silk with one cotton. The paler colours are from exhaust dyeings.