What is the ruling on praying while wearing dyes that prevent wudu, out of ignorance?

Question:
Some women use certain dyes that prevent water from reaching the skin?

Answer:
If there is something that prevents [water from reaching the skin], it must be removed. Anything that prevents water from reaching the skin must be removed in wudu and ghusl: dough, dyes, or nail polish. The common people call it: nail polish. It is obligatory to remove it so that water reaches the skin.
Q: But if she prayed while ignorant of the ruling, and prayed for a long period?
A: For the long period, Allah has forgiven what has passed. But if it was a small amount—one or two obligatory prayers—she must repeat them. She is instructed to repeat them. The Prophet (peace and blessings be upon him) remained silent regarding many women with irregular bleeding; he did not order them to repeat their prayers, and a long time had passed for them. And the Bedouin whose prayer was defective was ordered to repeat the current prayer, but he was not ordered to repeat the past ones; because this could become long and numerous.
Q: The woman who prayed while ignorant, is she excused, or is it the large amount?
A: If it is one or two obligatory prayers, she repeats them as a warning and to encourage rectitude. But the thing that has passed for months or years is difficult. When the Messenger (peace and blessings be upon him) taught the Bedouin, he ordered him to repeat the current prayer, and did not say to him: repeat your past prayers. And the women with irregular bleeding who left off prayer for a long time, he taught them, and did not say to them: repeat what has passed.