Seeing many stains on black clothing

Hello, I wanted to ask if a woman these days has many stains that are not prohibited because she ensures there is no white but only black, is she permitted, or is the permission only when finding a stain as per the language of the Mishnah, and she is not considered as finding but accustomed to stains? I would appreciate clear sources. Thank you very much.

Hello 

According to the fundamental decree of the sages, there is no difference between one stain and many stains. Each is judged on its own, if it meets the conditions for permission. 

The main point here is that according to the Torah, as long as there was no sensation, she is pure. The sages decreed to render impure also when finding a stain, and they were lenient in several matters in this regard, such as with colored clothing, as you mentioned. 

Indeed, the great poskim have instructed that all this was in times when sightings were with sensation, therefore any sighting without sensation is not prohibited by Torah law. However, in our times, when many sightings and complete cycles do not come with sensation, and it is obvious that they are prohibited as 'sighting' and not as 'stain', therefore one should not be lenient with many stains or large stains in general, and it is necessary to check in each case whether it is a 'stain' or a 'complete sighting without sensation'.

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