Thymol Blue - molar absorptivity

I did a lab about spectrophotometry and right now I need the molar absorptivity(ε) of thymol blue in acidic solution and also in basic solution. I have tried looking online but I haven't found the data I need.


What is the molar absorptivity of thymol blue in acidic solution and in basic solution?
 **information**
The specific wavelength is 540.27 nm for the acid and 601.88 nm for the base.




First of all, molar absorptivity is dependent on wavelength, so you either need to specify a wavelength or you need the entire spectrum.


When searching for absorptivity, it's often effective to search for the older name 'extinction coefficient'. Using that search term in Google, I found an absorption spectrum for thymol blue [here](http://www.phywe-es.com/index.php/fuseaction/download/lrn_file/versuchsanleitungen/P3031101/e/LEC03_11_LV.pdf) (pdf).


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