That is fine. Concerns about product cleanliness - especially for foods - and concerns about safety may make it close to illegal to offer the other kind of tour, let alone concerns about proprietary processes.
It is nonetheless amazing how interesting, informative, and engaging these experiences can be.
http://www.crayolaexperience.com/easton/things-to-do/things-to-do-with-kids/crayon-factory.aspx
One of the interesting things to me was as they talked about the creation process, and she was looking for something that could be used cleanly. I had never realized how remarkable crayons were for that. It's not just paint that can make a mess, so do charcoals, and oil pastels, and I never do much drawing with my pen without getting some on me. And Crayola are the best; just try comparing them to other crayons.
The other very interesting thing for me was that for all of the different crayon colors they have, there are only about eight label colors. It's certainly more practical that way, but it's something that I had never thought of.