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1
If a residue remains which is sufficiently colored to obscure the end-reaction of the permanganate, it must be
removed
by
filtration
.
2
If the residue is white, or known to be free from iron, it may be neglected and need not be
removed
by
filtration
.
3
The residual amounts of the Total Organic Solids (TOS) in glucose syrups are
removed
by
filtration
and purification during starch processing.