[Histonet] eosin

[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