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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Faraday as a Discoverer by John Tyndall: the iodide, and formed a brown spot where the iodine was liberated.
Then he immersed two wires, one of zinc, the other of platinum, each
1/13th of an inch in diameter, to a depth of 5/8ths of an inch in
acidulated water during eight beats of his watch, or 3/20ths of a
second; and found that the needle of his galvanometer swung through
the same arc, and coloured his moistened paper to the same extent,
as thirty turns of his large electrical machine. Twenty-eight turns
of the machine produced an effect distinctly less than that produced
by his two wires. Now, the quantity of water decomposed by the
wires in this experiment totally eluded observation; it was
immeasurably small; and still that amount of decomposition involved
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