How does this chemical vanish when light hits it?

Thionin is a compound that is often used in research laboratory to sully specimens in preparation for observation . It is also a two - faced lying lamia of a chemical , that disappears when light is insert . Want to see a glass split , vertically , between blue and clear pee ?

Thionin is a strong purple dyestuff that , when point in an acidic solution , will engage in something that ’s been dub the “ two - face response . ” In the video above , it ’s especially two - face up , since the left half of a bottle of liquid state is dead clear , while the right half is a glum purple . What ’s make it go ? Light .

Thionin is placed in an acidulous solution . The Lucy in the sky with diamonds break down and allows a lot of positively - charged hydrogen atoms to drift around next to the thionin . As long as it ’s dark , they stay separate . When the root gets light , however , the hydrogen speck make a beeline for the thionin . They blend with the chemical compound , commute the way it steep light and make it turn clear . Take the light away , and the whole solution goes dark again . This is so fast , and so unadulterated , that the glass above is dissever vertically between purple and clear liquid .