To the annulus that has changed oxygen radical or already the cross-linking in solidify epoxy resin is unit, do not have simple exclusive experiment method of the gender. Epoxy resin is phenolic to phenolic Gibbs indigo the experiment is to reacting (as a result of A) of existence double phenol. As contrary as phenolic colophony, acidify to the chromium of formaldehyde experiment is negative reaction.
When undertaking under 260 ℃ hot tearing is solved, all epoxy resin can produce aldehyde. Measure is: Put in canal of hot splitting decomposition try feign, nozzle is used new the natrium of cyaniding of 5 ％ nitro- that make up and the filter paper with the aqueous solution wet embellish of Lin is enclothed, heat in oil bath to 240 ℃ . When the gas that hot splitting decomposition gives off adopts filter paper. Filter paper changes blue makes clear is epoxy resin colophony.
It is some OKer also to use method of make known to lower levels differentiate epoxy resin: Below room temperature, take colophony of about 100 milligram at making an appointment with 10 milliliter thick vitriolic in, add thick nitric acid of about 1 milliliter next. After 5 minutes, add 5 ％ oxyhydrogen carefully to change sodium aqueous solution to the coping of solution, if be put in fat of exemple of oxygen of double phenolic A annulus, the interface of two solution can appear cherry is gules.

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