This may involve removal of undissolved substances, dissolved substances and harmful microbes. It describes the balance between dissolved ions from the salt and undissolved salt. It also has the advantage of accommodating chemically complex samples with undissolved particulates. An incomplete initial austenitization can leave undissolved carbides in the matrix. Rapid wetting or permeation may also leave behind undissolved gases which could cause electrode degradation. The result can be insufficiently sweetened tea or gritty, undissolved sugar crystals in the tea. Their inclusions of undissolved flux can look like inclusions in natural chrysoberyl. Upon waking he learned that the powder was undissolved sugar. A harsh burn on a child from an undissolved tablet has been reported. On January 1, 2011, undissolved civil unions became same-sex marriages.