To the critical reader
This book is the result of more than six years of research on its protagonist, his life and work. Although at the point of departure there were only very few documents available, I was lucky enough to discover a lot of surprising things. The initial intention to write a somewhat larger but rigorously researched article, completing the poor biographical notes and rectifying the not few errors of what had been previously published, felt short because of the scope and volume of Torres’ activities I could trace.
 Varro E. Tyler: Philatelic Forgers. Their lives and works, London 1976. José Majó Tocabens, Andrés Majó Díaz: Plácido Ramón de Torres, en Postas y Filatelia en Barcelona del XIX, p. 98-107, Barcelona 1975.
The research was quite complicated. It supposed not only the consultation of many European libraries and archives and even some American ones, but as well the lecture of nearly all available European philatelic magazines of the 19th century. This would have been impossible to achieve without the precious help of two websites highly recommendable to all people interested in aspects of the early history of philately. The main problem related to the search and detection of forgeries made by our protagonist was the great number of regions and countries affected, whose stamps I had never seen in my life, but which were important to create a database for evaluation and comparison.
Partial results of the research have been meanwhile published in specialized magazines all over the world, including the prestigious London Philatelist. The fact that different editorial teams approved them and that even some articles were re-published and/or translated into other languages seems to confirm the consistency of the discoveries and conclusions.
 Early British Stamp Experts and Spanish forgeries, The London Philatelist, April 2017, vol. 126, 1444, p. 132-138.