This is the last thing we got to see a member of B.A.P do in 2013 and I don’t know how to feel about that.
The colours & chemistry of some common pH indicators: http://wp.me/p4aPLT-aM
PDF download via the above link, and also available to purchase in large poster form here.
Because everybody loves Choi Siwon, #HappySiwonDay!♥
gif&pics cr to the respectful owner