Two toddlers fed on Mellin's food for infants, with testimonials by their parents advertising Mellin's product. Process print, 25 September 1897.
The pattern
This still is filed under Borrowed medical authority.
Define
The claim wears a lab coat: a diagram, a percentage, a clinical tone that is not necessarily a clinician.
Mechanism
Authority costume. Science-looking form transfers trust. Use it only when the substance matches, or we are documenting a historical mechanism. We do not recommend the abuse.
Verdict
We have real evidence and the buyer needs it in a form they already trust: a chart, a protocol, a named standard.
Why it works
Photographic proof was powerful in 1897. Showing the actual healthy babies alongside authentic-looking letters from mothers provided indisputable visual evidence of the product's efficacy.
Steal this when
When visual evidence of the 'after' state is your most compelling selling point.