To use them, you’ll need to use dry plate holders before you put them behind the lens.
So what’s so cool about these? According to Galaxy:
“Large format ensures a very wide tonal range of prints and fantastic resolution. The images taken from glass plate negative demonstrate a very smooth transition from shadows to lights and the highlights because the glass helps diffuse the light, providing the whole tonal shift. This creates a certain depth, and the image looks very realistic, smooth, clear, almost three-dimensional.”
This explains a lot when you consider what film manufacturers say about how film works. These plates are slated to be ISO 200, black and white and available in packs of 10 with 4×5, 6×7, 8×10 and 16×20 sizes available.
To start with though, they’re going to be expensive for reasons that this all really does cost a lot of money. For starters, materials for glass production are expensive.