The stain of ink that is applied on election is in the ruling of a strong/semi-permanent ink stain. It is not deemed a thing with a body/coat. For this reason, there will be no effect on the validity of wudhu. Therefore, the wudhu will be valid, even with its presence.

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للمفتي محمد أشرف الاشاعتي

Vol.1 Pg.89