I am sorry I did not do this step by step with an actual bead... but I am sure you get what I am saying. I will try and work on the step by step with an actual bead this week... Hmmmmmmmm think I owe this forum a halibut tutorial too.....
I start out with vetrofond black and make a tube bead... about a 45mm long on a 3/16th mandrel.
Make sure the tube is nice and smooth all the way around before you add the white lines.
Then swipe on sideways lines of white from one end to the other all the way across.
Then take a sculpting blade and cut right down the middle... like your going to cut it in half all the way around.
Next, lay in a line of intense black stringer or the vetrofond black then melt that all the way in smooth making your bead like a tube again.
Then super heat half or 1/4 of the bead to molten and twisting on the marver like your trying to smooth it out again, but dragging the glass to distort it. Do the other half the same way.
This will pull the outer edges in a different direction then the middle and give it that zebra
At this point the bead should look like it is a roller coaster or a bell curve.
Next melt the tube bead untill it is nice and smooth.... then add the "end caps" in your choice of black or white.
I really enjoyed making these beads for Beths black and white bead study.
I do beleive I am going to try these out with ivory next torch session.
Hope you all have fun making these.... I sure did!
If you have any questions please email me rather then a PM. It makes it easier for WC and me!