Hi Rose,
I'm not 100% sure if this is what you're asking about.. but it sounds like encased stringer. Here's a photo:
The 'rose' is encased stringer. All you have to do is encase an opaque with a transparent and pull into stringer. For this rose, I just grabbed a rod of opaque dark pink and wound transparent rubino oro over the last inch or so of the rod, melted the two colours carefully, and then pulled it into stringer and applied the rose and left the design raised. You can of course melt the rose in or encase it as in an encased floral... but the actual process of creating the encased stringer is the same. I hope this is what you were asking about and that my directions are clear enough. Corina mentions this technique in Passing the Flame too, so if you have her book, you should be able to find it under 'Cane'.
Cheers,
Sue
