 The ink on many of these papyrii had faded to the point that no text at all was visible to the naked eye, yet using state of the art techniques borrowed from satellite imaging , researchers were able to use infra-red light to see the faded ink.
<clarity>  The ink on many of these papyrii had faded to the point that no text at all was visible to the naked eye, yet using state of the art techniques borrowed from satellite imaging , researchers were able to use infra-red light to see the faded ink.
 The ink on many of these papyrii had faded to the point that no text at all was visible to the naked eye, yet using state of the art techniques borrowed from satellite imaging , researchers were able to use to see the faded ink.