use conventional film then send for slide process also can, but slide going thru normal lab process tend to yield more favourable results. reasons for doing that is because of certain color shifts that some ppl like.
variations aplenty, different slides sent to different processors will yield different results.
Call up Joanne on 98583502 for more info. Their office is at Midlink Plaza, Middle Road. They will explain to you in details how slide will work for cross process method.
They will also explain to you how much exposure is needed. They will let you know too more approatiate slide film to use for cross process. And last but not least, let you have a look on how they print out a cross process film.