Stretching my old grey cells I recall that Cross processing is the procedure of deliberately processing photographic film in a chemical solution intended for a different type of film. Cross processing usually involves one of the two following methods:
Processing positive color reversal (slide) film in C-41 chemicals, resulting in a negative image on a colorless base
Processing negative color print film in E-6 chemicals, resulting in a positive image but with the orange base of a normally processed color negative.
There are digital filters available to replicate this, but they do not have the unpredictability of the film process where time and chemical mix will vary the effect. I think I last tried this about 35 to 40 years ago..... Results are unpredictable as freshness of chemicals, temperature, time all have different effects especially when reacting with a film they are not intended for. Glennis, if I were you I try to do it myself, much more fun and satisfaction.....