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A prisoner caused another inmate serious facial wounds by repeatedly smashing a cup in his face, a court heard.
Michael Eyers, from Medway, attacked John Stewart in his cell at Elmley Prison, Sheppey, because he believed he had taken his toiletries.
Now, Eyres has been convicted of wounding with intent and could be facing an indefinite jail sentence for public protection.
Eyres, formerly of Jutland Close, Allhallows, now of no fixed address, denied the charge, claiming he was not responsible for the attack.
He was in March last year jailed for 21 months for false imprisonment, assault causing actual bodily harm, outraging public decency and common assault.
He was sentenced to five years in 1997 for wounding a man with intent in Chatham.
Judge Michael Lawson, QC, sitting at Maidstone Crown Court, adjourned sentence until June 17.