The mechanism of bloom formation on untempered and undertempered
chocolate is different from that of other types of bloom.
When melted chocolate does not contain enough seed crystals, cocoa
butter will crystallize in an unstable polymorph. The subsequent recrystallization
to more stable polymorphs results in a contraction effect
of the cocoa butter crystalline matrix, which pushes cocoa solids
and sugar particles to the surface of the chocolate