Light bulb moment!

So with a horrible day i didn't have a chance to do any sun printing yesterday. It was miserable! But I had a brief moment this moring with the sun making a slight apperance through my patio doors... so I took my chance! Now this tells me that my plan of making some kind of plate will work as it picks up marks on glass... heres my lightbulb moment - it's even picking up the tiniest of marks on the glass (I asume they come from the blowing process used to make the bulb shape) I can barely see these with my eyes but the cyanotype picks them up beautifully :D any sunlight tomorrow will be used to print and investigate further! :)