▁what ▁is ▁added ▁to ▁the ▁liquid , ▁with ▁le mon ▁ju ice ▁turning ▁it ▁pur ple . ▁In ▁Th ailand ▁and ▁Vietnam , ▁this ▁but ter fly ▁blue ▁pe a ▁flower ▁tea ▁is ▁commonly ▁mixed ▁with ▁h oney ▁and ▁le mon ▁to ▁increase ▁acid ity ▁and ▁turn ▁the ▁be verage ▁a ▁p ink - pur ple ▁color , ▁to ▁produce ▁for ▁a ▁drink ▁usually ▁served ▁after ▁dinner , ▁or ▁as ▁a ▁refresh ment ▁at ▁hot els ▁and ▁sp as . ▁The ▁drink ▁is ▁a ▁typical ▁local ▁drink ▁like ▁cham om ile ▁tea ▁is ▁in ▁other ▁parts ▁of ▁the ▁world . ▁The ▁tea ▁is ▁found ▁in ▁both ▁hot ▁and ▁cold ▁vari eties ▁▁ ▁The ▁flowers ▁have ▁more ▁recently ▁been ▁used ▁a ▁in ▁a ▁color - ch anging ▁g in . ▁Blue ▁in ▁the ▁bott le , ▁it ▁turns ▁p ink ▁when ▁mixed ▁with ▁a ▁carbon ated ▁mix er ▁such ▁as ▁t onic ▁water ▁due ▁to ▁the ▁change ▁in ▁p H . ▁As ▁organ ic ▁colours ▁are ▁not ▁permanent , ▁this ▁type ▁of ▁g in ▁is ▁recommended ▁to ▁be ▁stored ▁in ▁a ▁dark ▁place ▁to ▁maintain ▁the ▁effect . ▁ ▁Trad itional ▁medicine ▁In ▁traditional ▁Ay ur ved ic ▁medicine , ▁it ▁is ▁as cribed ▁various ▁qual ities ▁including ▁memory ▁en han cing , ▁no otrop ic , ▁ant ist ress , ▁an xi ol yt ic , ▁ant ide press ant , ▁ant icon v uls ant , ▁tran qu il izing , ▁and ▁sed ative ▁properties . ▁ ▁In ▁traditional ▁Chinese ▁medicine ,