TECHNIQUES

Working on burnishing here, and I keep running into a problem which I think is just a product of my own impatience: I can’t seem to get from a bunch of burnished lines to a fully burnished page. Here's a recent example:

You can see there are still a number of unburnished areas on the page. I use a giant cowrie shell to burnish, and often find that it “slips” and goes back into the line I’ve already burnished, rather than going over the unburnished bits. I suppose the paper will wear down over time, but I’m wondering if I need a different technique or tool for burnishing work? I’ve seen Vaishali use a wide flat burnisher that seems like it would overcome this, but I’m wondering if other beginning burnishers struggle with this too.