Lithography TPT lecture: Development

Part four of a lecture on UV contact lithography in seven parts. This part on development covers the development principle, and development effects, as well as resist tone, photochemistry, and contrast. Authors: Tine Greibe, and Thomas Anhøj.

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Thank you for the video I have a few questions.
1. I am wondering what exactly bleaching is? Is it a diffusion?
2. I am wondering what polarity change would do to allow to make pr
3. What does dose mean in 13:12? Dose is said throughout the lecture but I dont understand the exact meaning
Thanks again for the lecture