Schreinemaker's analysis
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Schreinemaker's analysis is the use of Schreinemaker's rules to create a phase diagram.
After applying Schreinemaker's rules and creating a phase diagram, the resulting geometric figure will be thermodynamically accurate, although the axes will be undetermined. In order to determine the correct orientation of the geometric figure obtained through Schreinemaker's rules, one must have additional information about the given reactions or go through an analytical treatment of the thermodynamics of the relevant phases.
Univariant lines are sometimes called reaction lines. The extension of a univariant line through the invariant point is called the metastable extension. Univariant lines are usually drawn as a solid line while their metastable extensions are drawn as a dotted line.
Univariant lines and their metastable extensions are often labeled by putting in square brackets the phase that is absent from the reaction associated with the given univariant line. In other words, since every univariant line represents a chemical equilibrium, these equilibrium curves are named with the phase (or phases) that is not involved in the equilibrium.
Take an example with four phases: A, B, C, D. If a univariant line is defined by the equilibrium reaction A+D←→C, this univariant line would be labeled [B], because the phase B is absent from the reaction A+D←→C.
