Answer
Boots Anaesthetic Throat Spray containing lidocaine lists Patent Blue V (E131) and Quinoline Yellow (E104) as colouring agents.
Sources for this answer
- Boots Severe Sore Throat Relief 2% w/v Oromucosal SprayTHE BOOTS COMPANY PLC · emc · SmPC §6.1 List of excipients · Version 13Document updated
Sources checked