A 19-year-old boy has been charged over a noxious substance attack involving a man and a woman in east London on 4 July.
Mustafa Ahmed faces one count of wounding with intent to do grievous bodily harm, and one count of attempted wounding with intent to do grievous bodily harm.
He will appear before Thames Magistrates Court on Tuesday.
Two victims, a man in his 20s and a woman in her 40s, had to be taken to hospital for treatment following the incident on Burdett Road in Mile End.
Scotland Yard said three other teenagers arrested on suspicion of GBH have been released under investigation.