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The different species formed when gaseous formaldehyde is dissolved in aqueous medium are investigated by a 13C NMR flow-through technique and the spectra of commercial aqueous formaldehyde solutions containing methanol completely interpreted. 13CH2O was used to study the crosslinking reaction with gelatin which leads to methylene and oxymethylene bridges between gelatin-amino-groups. On ageing, hardened gelatin shows an increase in the number of methylene bridges.
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Albert et al. (1986) studied this question.
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