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Preparation of aldehyde fuchsin normally requires ripening for 3 to 5 days. By using a 5-fold excess of paraldehyde a fully potent aldehyde fuchsin can be prepared in 24 hr at room temperature. Aldehyde fuchsin prepared by both normal and accelerated ripening afforded comparable results, including selective staining of unoxidized pancreatic B cells. Dried aldehyde fuchsin prepared form pararosaniline and reconstituted in acid alcohol has spectrophotometric properties different form the ripened strain. Reconstituted aldehyde fuchsin stains unoxidized B cells adequately only if staining time is extended. Excess paraldehyde added to reconstituted aldehyde fuchsin retards decomposition but does not produce a normal stain by spectrophotometric standards. Warming of aldehyde fuchsin solutions to accelerate ripening has been shown to produce deleterious effects and should be avoided.

The role of paraldehyde in the rapid preparation of aldehyde fuchsin.