further looking for DCm and pyridine, i found that, which is quite interesting i think:

 

http://www.chemistryviews.org/details/ezine/737151/Puzzling_Pyridine_Problem_Probed.html

 

pyrdine derivatives/salts can form unanticipated or undesired compound(s) with DCM. However the formation of them seem slow.

With regards to your last post, I wouldn't worry about it. The time scale they're looking at it day, rather than the second/minutes you'll be working on.

 

I am not as familiar with working with emulsions. My assumption would be that yes, it would not evaporate as quickly or at least not very well if you managed to encapsulate the DCM somehow, but I am not 100% sure on that.