After his death in 1902, Maddox's daughter Isabella wrote: "My father's medical attendant, Dr. Wales, said that it was 'the triumph of mind over body' that had kept him alive for so long." The obituary in the Almanac of the British Journal of Photography was not entirely uncritical, saying that the "real difficulties of the process were encountered and overcome by those who came after Maddox...whose ideas were not altogether practicable."
Following his death in 1902, Isabella Maddox wrote that her father's physician, Dr. Wales, attributed his longevity to "the triumph of mind over body." The obituary in the British Journal of Photography's Almanac was less complimentary, stating that while the process faced challenges, those who followed Maddox successfully overcame them, noting that his ideas were not entirely feasible.