Crackle technique with fused glass

I'm very interested in finding out more about the crackle technique I see in many glass galleries --  I suspect that it is similar in process to making glass lace or crater glass design elements, but have been unsuccessful in finding any solid information.

Any guidance would be appreciated!

Hi everyone--since this request for info was posted, I've taken two of Bob's workshops at his studio on Saltspring. Great teacher, and I recommend those interested to jump at the opportunity to study with him. Cheers W


Hi Wen,

Are you talking about this effect:

copyright Robert Leatherbarrow. all rights reserved

If so, that is something that Robert Leatherbarrow ( developed and teaches.

Helios Kiln Glass Studio



Yes--I've seen a few artists exhibiting using this or similar techniques, and know that Robert teaches.  However, I have seen some hobbyists showing pieces on line obviously using some type of powder techniques that are similar, so I was hoping there was some generally available information or advice.



Pam B After seeing the

Pam B

After seeing the crackled look I was impressed.  I found this and I think it explains a bit.

Cohesion on a liquid's surface results in a film-like force called surface tension. This is the same force that causes water to bead up.

"When glass is heated to a liquid state, it too falls subject to surface tension. With soda-lime glasses (i.e. most common art glass) at fusing temperatures the surface tension forces the liquid glass to a height of about 5 mm. That means that if the glass is thinner the surface tension will pull it into a smaller area. If the glass is thicker then it will spread to a larger area until the height is about 5 mm. As the temperature rises, cohesion -- and thus surface tension -- weaken and the glass will spread more.

Surface tension can be a useful force for the artist who understands it. Well known kiln-glass artist Bob Leatherbarrow uses surface tension to achieve is unique trademark "crackle" technique."

Now I too want to find out more.  I am not sure and have yet to try it but it sounds like confetti or a thin layer of frit could accomplish this???


Thanks for your this

Thanks for your this beneficial sharing.

when's the next workshop

when's the next workshop with leatherbarrow at Helios?

The Crackled efect

How would one go about achieving this look on a longhorn skull.




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