I do not think it will redarken. The Effasol works differently than B4 or Color OOPs.
Glad to read that your hair recovered to the point that you think you will only lose 1 inch when trimmed.
As desperate remedies go around here, you did very well, lol.
Effasol ingredients - colour mine
http://www.amazon.com/LOREAL-Effasol.../dp/B001GENN9Y
"Ingredients
Ammonium Chloride, Cellulose Gum, Dioctyl Sodium Sulfosuccinate, EDTA,
Potassium Persulfate, Sodium Benzoate, Sodium Lauryl Sulfate, Sodium Metasilicate, Sodium Persulfate, Strontium Dioxide, Ultramarines."
http://www.chemicalbook.com/Chemical..._CB6854294.htm
"Potassium persulfate is an oxidizing agent"
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