I bought a box of 4x5 dry plates by Lane. I rated and exposed them per the label at ISO 2. Sent them off to Blue Moon for processing. They are significantly under exposed, some showing no discernable image while most have an image only suitable for scanning as a negative with enhancement in photoshop.

I am ok with this as this is my first use of glass plates of any sort and my first use of materials from Lane. This post is not intended to be a complaint.

My question is: What is a reasonable ISO rating for these materials if the intended use is to create Ambrotype style images to be viewed by reflected light? I am now guessing something like 1.0 or 0.5.