This is a picture of the ebony stain mixed in the tung oil. This is also European walnut, which in my opinion is walnut in name only. There the similarity ends.
This is mahogany stain on American walnut. Remember it will add a red tint to your gun. And different pieces of walnut will react differently.
This is mahogany stain on english walnut. I personally do not believe in staining walnut because it clouds the figure. In this case it is what tthe finish was like on some english sporting rifles so I replicated it.