What are these black markings?
Can anyone tell me what these black markings are and why only some 104glass is afflicted?
I’m relatively new to Lampworking but have been fusing for a while now.
I think this is caused by scum coming out of the torch??!!
I’ve recently bought the effetre opalino glass and they are all very susceptible to this discolouration. Any one else found this to be the case?
Any help would be very much appreciated 😊
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