, ▁the ▁se eds ▁are ▁claimed ▁to ▁be ▁sometimes ▁co ated ▁with ▁a ▁chemical ▁that ▁cannot ▁be ▁removed ▁with ▁was hing ▁that ▁is ▁designed ▁to ▁cause ▁un ple asant ▁physical ▁sympt oms ▁such ▁as ▁n ause a ▁and ▁ab dom inal ▁pain . ▁The ▁book ▁states ▁that ▁this ▁chemical ▁is ▁also ▁to xic . ▁ ▁Col our ▁change ▁In ▁I pom oe a ▁tr icol or '' ▁' He aven ly ▁Blue ', ▁the ▁colour ▁of ▁the ▁flower ▁changes ▁during ▁bl oss om ▁according ▁to ▁an ▁increase ▁in ▁vac u olar ▁p H . ▁This ▁shift , ▁from ▁red ▁to ▁blue , ▁is ▁induced ▁by ▁chemical ▁modifications ▁affect ing ▁the ▁anth oc yan in ▁mole cules ▁present ▁in ▁the ▁pet als . ▁ ▁References ▁ ▁External ▁links ▁E row id ▁Mor ning ▁Gl ory ▁v ault ▁ ▁Category : An n ual ▁plants ▁Category : Ent he og ens ▁Category : Fl ora ▁of ▁South ▁America ▁tr icol or ▁Category : Her bal ▁and ▁fung al ▁hall uc in og ens ▁Category : N atural ▁sources ▁of ▁ly ser g am ides ▁Category : V ines <0x0A> </s> ▁Brig ad ier - General ▁Sir ▁Thomas ▁Pr ender g ast , ▁ 1 st ▁Baron et ▁( c . ▁ 1 6 6 0 ▁– ▁ 1 1 ▁September ▁ 1 7 0 9 ) ▁was ▁an ▁Irish ▁politician ▁and ▁soldier . ▁ ▁He ▁was ▁the ▁son ▁of ▁Thomas ▁Pr ender g ast ▁( d . ▁ 1 7 2 5 ) ▁of ▁Cro