This does work, but it's a lot quicker to just use Mug Shot. I got 5 scrolls in about 1.5 hours of play that way.
The same goes for Kaleidoscopes. Actually I collected them so fast that I collect two additional ones without realizing it. It took less than an hour to collect 5. I already had 2 from that one quest, so maybe that is way I overcounted. --- --- Cheers! Arc the Lad 2 is still my No. 1.