Results of practice show that boron glaze is of high-performance, non-poisonous and low cost. So it is able to substitute for lead glaze.

结果证明，硼质釉料无毒、性能优良、成本低，完全可取代有毒的铅质釉。

youdao

Glaze is mostly translucent, but da Vinci would also slip in small amounts of pigments, such as manganese and lead oxides.

釉料大多是半透明的，但达芬奇也会添加少量色素，如锰，氧化铅。

youdao

In those cases where leaded frits seem necessary, it is recommended to fire to at least cone 03, to ensure sufficient reaction of lead and glaze ingredients.

在那些含铅玻璃料似乎必不可少的情形下，建议至少在03锥级下烧制釉料，以确保铅与釉料中的成分反应充分。

youdao

Was it true that the glaze of old Fiestaware contained dangerous amounts of lead?

NEWYORKER: Good Neighbors

But although the new boron-based glaze now costs only a third as much as the traditional lead-based mix, getting people to change a centuries-old tradition is not easy, says Eduardo Berrocal of Fonart.

ECONOMIST: A battle for lead-free pottery