A few questions about photo store processing

A few questions about photo store processing

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Even though they use computers Its 100% percent photographic chemistry correct?

Is it possible to make effects on these processors? I know I can make an image a solid color, like cyan, or green. Much like a color copier? Anything else?

Is it possible to print on a transparency rolls from processors?

How much do slide positives usually cost? Are they still making them?

How much is resizing positives usually cost?

These questions are best put to the particular store.They are not all alike.