Mr Taylor published C.F. Goldie: His Life and Times in 1977 and followed it up with CF Goldie: Prints, drawings and criticism in 1979 and CF Goldie: Famous Maori leaders of New Zealand in 1993.
Now working on a catalogue listing all of the artist's works, he contacted the Advocate after Victoria University of Wellington art lecturer Roger Blackley said he thought the Northland man's picture was likely to be a painted photographic enlargement of a type large photographic establishments of the late 19th century produced for clients who wanted an impressive framed portrait.
Mr Taylor disputed the quality of Associate Professor Blackley's "off the cuff opinions" and the worth of a book the art historian had written about Goldie.
"I have long been an expert on the authentication of Goldie works," Mr Taylor said, offering to examine the 88-year-old Northland man's grandmother-and-daughter picture.
"Goldie only did one painting of mother with child and that was a pastiche-ey type of thing for a New Zealand Herald Christmas supplement early in the 1900s.
"It is quite unlike the 'Goldie' your old fella has."
Associate Professor Blackley and Mr Taylor said positive authentication was impossible from an image and they needed to examine the canvas itself.