Tintypes were a type of photograph made on a thin metal plate, while solarization is a darkroom technique that involves briefly exposing a partially developed photograph to light. There is no direct link between tintypes and solarization, as they are two distinct processes in the history of photography.

Sun burning spots on the tender leaves. In some cases the photosynthetic apparatus in the leaves get damaged by excess of sunlight. this is called solarization.

Removal, selective broadleaf weed control and solarization are ways to kill weeds without hurting clover planted for bees. The herbicide needs to include among the product information the guarantee that beneficial insects such as bees will not be harmed. Removal requires either manual or mechanical removal while solarization uses landscape fabric or plastic sheeting secured on the ground around the clover.

Bulldozing, controlled burns, mowing, soil drenches, and solarization are ways to get rid of grubs, weeds, and worms at the same time. A combination of controlled burns, soil drenches, and weekly mowing generally controls pathogens and pests within a year. Bulldozing and solarization with weighted-down black plastic sheeting makes the soil inhospitable to pesty soil food web members.

Here's an article about soil solarization, a non-chemical way to kill weeds and prevent weed growth: http://landscaping.about.com/od/weedsdiseases/qt/killing_weeds.htm