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A. M. Naim O'Sullivan

Hi Vala.

Firstly I would try and dry the extract into a powder. These lets you control concentrations.

Next, what colour is the extract? If it is dark it may be causing interference. Try and dilute to a concentration whereby there is minimal interference. I would also suggest the use of colour blanks to help deal with colour interference.

Alsiddig Osama

please follow this method