ink until 1972. In 1995, Dr Earl Morris of the Dow Chemical Company stated that chloroacetamide has been found in preparations as early as 1857. A fourth test, this time using gas chromatography, found chloroacetamide present, at 6.5 parts per million. A fifth TLC test found traces of chloroacetamide, but this was attributed to contamination from the control. The test was carried out again, and no chloroacetamide was found. Among the investigators were sceptic Joe Nickell and document expert Kenneth W. Rendell. In Rendell's analysis, he was struck that the handwriting style seemed more 20th century than Victorian. He also noted factual contradictions and handwriting inconsistencies. Written in a genuine Victorian scrapbook, but with 20 pages at the front end torn out, he also found this suspect as there was no logical explanation for the purported author to use such a book. In January 1995, Michael Barrett swore in two separate affidavits that he was "the author of the Manuscript written by my wife Anne Barrett at my dictation which is known as The Jack the Ripper Diary." Adding to the confusion, however, was Barrett's solicitor's subsequent repudiation of his affidavit, then Barrett's withdrawal of the repudiation. Some people, including Robert Smith, the present owner of the diary and original publisher of the associated book by Shirley Harrison, insist it may be genuine. They argue that scientific dating methods have established that the book and ink used to write in it are from the 19th century; that the symptoms of arsenic addiction, claimed to be described accurately in the book, are known to very few persons; that some details of the murders provided in it were known only to police and the Ripper himself before the book's publication; and that one of the original crime scene photographs shows the initials "F. M." written on a wall behind the victim's body in what appears to be blood. These, they claim, refer to Florence Maybrick, James's wife, whose possible infidelities were the purported motivation for the murders. These claims are dismissed by the majority of experts. Pocket watch In June 1993, a gentleman's pocket watch, made by William Verity of Rothwell (near Leeds) in 1847 or 1848, was presented by Albert Johnson of Wallasey. The watch has "J. Maybrick" scratched on the inside cover, along with the words "I am Jack", as well as the initials of the five canonical Ripper victims.