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A firefighter has been unwell with frequent vomiting since attending a fire and inhaling fumes from burning plastic. Both the patient and the GP noted that the vomit is blue. I have a sample in front of me and it is blue. It behaves as an indicator - blue at acid pH and yellow in alkali, the colour change being repeatedly reversible. I suspect that bilicyanin would not behave like this. The patient is not on any drugs and is not consuming sweets. Any ideas? Phil The information contained in this email may be subject to public disclosure under the Freedom of Information Act 2000. Unless the information is legally exempt from disclosure, the confidentiality of this email and your reply cannot be guaranteed. The unauthorised use, disclosure, copying or alteration of this message or any information contained within it is forbidden. It is intended for the addressee only. If you are not the intended recipient, please notify the sender immediately and delete the email from your system. The views expressed within this email are not necessarily the views or policies of the originating NHS organisation. E-mails are not considered a secure medium for sending personal information and may be at risk. Recipients should run anti-virus software before opening any attachments. All liability is excluded to the extent permitted by law for any claims arising from the use of this medium by this organisation. ------ACB discussion List Information-------- This is an open discussion list for the academic and clinical community working in clinical biochemistry. Please note, archived messages are public and can be viewed via the internet. Views expressed are those of the individual and they are responsible for all message content. ACB Web Site http://www.acb.org.uk List Archives http://www.jiscmail.ac.uk/lists/ACB-CLIN-CHEM-GEN.html List Instructions (How to leave etc.) http://www.jiscmail.ac.uk/