Mahogany is a really nice warm opaque brown, that is properly brown rather than dark red.
I used Tiger Lily for the pumpkins on this gremlin, and you can see that the opacity varied a lot. Some of the pumpkin segments stayed very transparent.
These bicones have a base of Mahogany, with a wrap of Poppy round the centre, and the largest has a thin wrap of Tiger Lily on top of that. This was in the same sessions as the gremlins, so I didn’t actually know they weren’t opaque at that point! Tiger Lily especially looks pretty opaque in the rod. So the result is rather more subtle than I was expecting.
Cobblestone is a nice slightly brownish grey. Fairly uniform and non-streaky here.
I used Double Helix Okeanos on top of Cobblestone here (unreduced), and got some fab colours! The Cobblestone has fumed darker and browner around the dots especially. Showing both sides, as one is bluer and one greener.
I decided to do more combos with Mahogany. These are small rounds with a tiny core of clear, to make my rod of Mahogany go further. Definitely a true opaque! I wrapped one in fine silver wire, the next has a wrap of SIS, then Cobblestone dots, a spiral of black, and finally spreading dots of Reichenbach Kermit (a special: SPL1000).
I did the same thing with Cobblestone, here you go:
They’re both nice colours to use like this, and look great with each other, both staying crisp in the dots. They are both somewhat reactive with the silver, ivory and green, but not overwhelmingly so.