The man pulled out a small bottle and said it was pepper spray before spraying it in the direction of the victim
At around 7.30pm on Saturday 11 October the victim was entering Bond Street Underground station with her sister and two young children, one of whom was in a pushchair.
A man and women were walking together in front of them when the woman collided with the pushchair, the British Transport Police has said.
The man then began shouting racial abuse at the victim and her family, before the woman grabbed her hair.
When the victim tried to defend herself the man pulled out a small bottle and said it was pepper spray before spraying it in the direction of the victim and her family.
The woman shouted abuse and made lewd gestures at them before both parties left the area.
Enquiries to establish what the substance was are ongoing. There were no ill effects reported.
Officers believe the man and woman in the image could have information that may assist their enquiries.
Anyone who recognises them is asked to text BTP on 61016, using the reference 413 of 12 October. Information can be given anonymously to Crimestoppers on 0800 555 111.
