I understand now. Yes indeed, the RAW file does contain all the colour information.
However, as I've written on here before, the photograph that I capture will NEVER be made into a colour image, even though I've captured the colour data in the RAW file. I see the colour at RAW processing stage. After that, it's consigned to the archive. The photograph was captured to be a B & W picture. If it doesn't make a good B & W it will be dumped.
I have the camera set to 'Monochrome' so that the JPG I see on the LCD when I capture the photograph is in Black & White, not in colour.
Similarly, I will never try to make a B & W out of a photograph that I shot to be a colour image. I will never even convert it to B & W 'just to see what it looks like'. That is just the 'rule' I have set for myself and continue to impose upon myself. It probably sounds stupid to 99% of people, but it works for me in terms of disciplining myself to really look at what I'm composing. I mean really, really look.
I hope that explains how I think about the images as I capture them.
So, in summary, there is no processed colour version of this image. The colour Tiff that was produced from Raw processing using DxO Optics is now a B & W TIFF after conversion using Nik's Silver Efex Pro 2. I do not have a colour TIFF.