mounting photos

What kind of tape do you use for mounting your photos to the back of the mat ?

I use scotch tape.. but that's just for my use. I have no idea what pros use, or what the printers I use for fulfillment do. Works for me, but if you're selling these, I'd wait for more input..

We had a similar discussion a while back, and one of the folks recommended acid-free Linen framers tape as the best (and professional) choice. Do a search for "framing tape" and you will find lots of examples as well as discussions of materials and methods.

I used to use simple masking tape but found that in an oblique light the photo paper was obviously not lying flat, so started using 3M spray photo mount adhesive. Just a light spray, not too much, over the rear of the photo and attach it to the backing card.

I use archival plastic tape, like this. If you get it hot enough with a hair drier, you can remove it without leaving a trace, but without heating, it is very sticky.