Hi Frankallen,
On Panaché, young stems are stripped vertically. When the wood matures, lets say after the winter, the wood reverts to all grey.
Sometimes washing the stem with water help highlight the variegation.
Sometimes in the leaves, when looking closer, you can see some shades/stains of green too .
If you have a cutting, you'll need to grow it for two seasons to be sure.
The stripping does show more when the tree is healthy and growing full strength. The bigger is the inter-node space, the better you'll see the stripping.
Mine is still small, just one year in my garden, and on one stem you can clearly see the nice stripping, and on the other stems with close nodes, it is much more harder to spot.
There are bushes for building hedges that you should cut back each year as only new growth shows a desired color ( like red, or yellow stems when young), and Panaché stripes are in that category . But as Panaché is grown for fruits, you often see Grey trunks and Grey scaffold stems with stripped wood and stripped fruits in the canopy.
So if you have a cutting, it may well be all Grey... So you need to grow it. In the second season, you should see the stripes ... and the stars are the figs . LOL .