You can tell, just from the decoloration of the ink.
2.
Demyelinization by MS . The Kl�ver-Barrera colored tissue show a clear decoloration in the area of the lesion ( Original scale 1 : 100)
3.
A third use of sodium bisulfite is as a decoloration agent in purification procedures because it can reduce strongly coloured oxidizing agents, conjugated alkenes and carbonyl compounds.
4.
Bone char possesses a low decoloration capacity and must be used in large quantities, however, it is also able to remove various inorganic impurities; most importantly sulfates and the ions of magnesium and calcium.
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