@minas6907 I've been making ~3-pound batches of fondant.
I then melt the fondant in batches of about .75 pound; that's the quantity for one of my 9x13 starch trays.
Just began using the invertase and not enough time has elapsed at present to know if it's working or not.
Which is a sort of jiggled truth: I'd been using invertase for about 3 weeks, but then a few days ago realized that I had grabbed a year-old+ bottle that hadn't been refrigerated instead of the new one I got to replace it. Bad brain fart; I mixed up the bottles when the new one came in.