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Several kinds of facts normally noted in the routine examination of a book suggest that the font(s) in which it is printed be analyzed in order to settle the issue of shared printing. Strictly speaking, such facts are not "evidence" of shared printing but rather should be viewed as "clues" to that possibility. In general, these clues represent disruptions in the regular patterns established earlier in a book in one or more aspects of printing style or method of imposition and almost always occur at the boundaries between sections of a shared book. Despite this coincidence, the analysis of the font(s) in the book provides the only entirely reliable evidence that the disruption is attributable to sharing rather than to some irregularity in normal shop procedure during the machining of the book.
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