Abstract: Methods for producing localized crystallization in a glass article may include depositing a nucleation catalyst onto at least a portion of a surface of the glass article to form an at least partially coated surface. The nucleation catalyst may be in a solution or in a slurry. The method may include heating the glass article to a nucleation temperature and holding the glass article at the nucleation temperature to form a locally crystallized glass article comprising a crystalline phase and a non-crystalline phase. One or more portions of the locally crystallized glass article adjacent to the nucleation catalyst may include the crystalline phase and a remainder of the locally crystallized glass article may include the non-crystalline phase. The method may also include cooling the locally crystallized glass article.

Abstract: A fining package for a glass composition may include a sulfate or a sulfide in an amount from about 0.001 to about 1 mol % of the glass composition. The fining package may include a multivalent compound, such as CeO2, SnO2, or Fe2O3, in an amount from about 0.001 to about 1 mol % of the glass composition. The fining package may be sulfide-free. The fining package may be free from a reducing agent for reducing sulfate to sulfide. The fining package may be free of at least one of Cl, F, Sn, Ce, and As. The glass composition may be used to form glass tubing. The glass tubing may be used to form a pharmaceutical packaging.