The folks at New55 have set up a FAQ and support page for their new positive/negative instant 4x5 film. If you were a kickstarter supporter of this project or if you have questions about how to use the new film (or any of their other products, like their instant-load 4x5 film or monobath developer), this is the place to go: https://new55film.zendesk.com/hc/en-us