The Shroud of Turin is much older than suggested by radiocarbon dating carried out in the 1980s, according to a new study in a peer-reviewed journal.
The 4m-long linen sheet was damaged in several fires since its existence was first recorded in France in 1357, including a church blaze in 1532.
It is said to have been restored by nuns who patched the holes and stitched the shroud to a reinforcing material known as the Holland cloth.
"[The radiocarbon sample] has obvious painting medium, a dye and a mordant that doesn't show anywhere else," Mr Rogers explained.
"This stuff was manipulated - it was coloured on purpose." In the study, he analysed and compared the sample used in the 1988 tests with other samples from the famous cloth.
In addition to the discovery of dye, microchemical tests - which use tiny quantities of materials - provided a way to date the shroud.