What matters is that this solution is transparent and sticks to nearly everything. Pour the collodion onto a glass plate, then the tilt the plate until its entire surface is coated with the solution.

opaque or patterned glass works exceptionally well for accent windows as it diffuses light beautifully and adds a decorative touch without being too transparent. If you're using an heirloom plate ...

What matters is that this solution is transparent and sticks to nearly everything. Pour the collodion onto a glass plate, then the tilt the plate until its entire surface is coated with the solution.