[citation needed] It is also particularly useful for localization of proanthocyanidins compounds in plants, resulting in a blue staining.

A colorimetric assay based upon the reaction of A-rings[clarification needed] with the chromogen.

p-Dimethylaminocinnamaldehyde has been developed for flavanoids in beer that can be compared with the vanillin procedure.

[6] The DMACA reagent may be superior to the vanillin procedure for the detection of catechins.

[7] The DMACA reagent changes color over several days when exposed to air but when refrigerated can be stored for up to two weeks.