Hello,

We are trying to have Dragendorff reagent. We found recipes already on articles but when we compare Sigma Aldrich branded Dragendorff reagent, there were obvious color differences. Our was more yellow while sigma branded was orange, so we checked sigma's components. It includes ethyl acetate(approximately 50%- 70%) We did some experiments but we couldn't see same performance.

Is there anyone to give us some tips?

Thanks in advance.