ANSWER:

No problem in this as it does not form a layer on the nails. However you must conceal this in front of non mahram men and while going out as this is a form of adornment.

Is it allowed to apply nail mehandi stains that is made by burning sugar/ jaggery/tea leaves and the evaporated liquid is collected and applied? It won’t peel off it just colours the nails.so will wudu be valid?