What is the ruling on removing the niqab and black gloves upon returning to a country where they provoke astonishment and fitna, and is it permissible to refrain from shaking hands with non-mahrams, which is a widespread good custom despite knowing its error?

There is no specific color required for a woman's hijab (definition), but it is recommended that she adhere to the colors customary among women in her society, as long as they do not violate Islamic law. As for the custom of women shaking hands with non-mahram (definition) men, it is forbidden by Islamic law and efforts must be made to change it. One should be gentle in inviting the ignorant [to the truth] and explain that refraining from shaking hands with non-mahram individuals is a response to Allah and His Messenger. One must also be patient upon the truth and not compromise on any aspect of the religion.