[Histonet] eosin

From:"Gudrun Lang"

Hi netters (by the way "nett" in German means "friendly and nice", that fits) 
Can anyone tell me what pH a 2% Eosinsolution in Aqua dest. without any addition should have?

Last time we measured ours with pH-meter it was around pH=8, what amazed me. An anionic dye in water is basic? 

If you prepare an eosinsolution, do you immidiatly add the acetic acid or just before use?

thanks
Gudrun Lang
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