
Only one thing to do: ask Clayart for help.
Happily, they came through. Several people posted a reply to the effect that Rutile can indeed, in the presence of enough calcium, produce pinks. Others reminded me that Rutile can contain Tin, and that Tin plus Chrome can produce pinks. And yes, the kiln load must have had some chrome vapour in it during the firing, as I had used a dark red Mason stain to paint some maple leaves on a few plates. One person suggested doing a short line blend with Red Iron Oxide.
Here are the results.
Hopefully, if the colour balance is accurate, you can see the pink. The tiles with RIO are, as I expected, shades of brown, with a greenish cast. A little too much like Baby Product #2 for my liking! The tiles with RIO and Rutile are a nice toasty colour, I rather like the darkest one.The last row of tiles, using a small amount of Rutile and varying the RIO are about the closest to what I want. The middle one will probably be what the customer wants.
Whew.
And, Thank You, Clayart!