I want to know the answer to the following question:
Pb2+ causes lead glass to have what?
All the background I'm provided with is that "The viscosity decrease of lead glass melt is very significant (roughly 100 times in comparison with soda glasses); this allows easier removal of bubbles and working at lower temperatures, hence its frequent use as an additive in vitreous enamels and glass solders.". Is that enough to answer the question?
Answer: no