The father of a man allegedly murdered in an acid attack by his ex said his son had identified her as the culprit using his tongue, a court on Thursday.

Cornelius van Dongen said Mark van Dongen, 29, used an alphabet sheet to name Berlinah Wallace, 48, as his attacker.

Mark was left paralysed from the neck down, unrecognisable and left virtually blind after sulfuric acid was poured over him and he later died by euthanasia.

Wallace, 48. is accused of throwing the substance at him while he lay in bed because he had started seeing another woman.

South African Wallace denies two charges of murder and throwing a corrosive fluid with the intention to burn, maim, disfigure, disable or do GBH.

Mark's father told Bristol Crown Court his son was able to name his attacker by using his tongue. Cornelius said Mark used an alphabet chart to spell "Berlinah" when asked who had attacked him.