lightproof

Example:She stored her photographs in a lightproof container to prevent exposure to light.

Definition:A container designed to exclude all light.

Example:The darkroom is a lightproof room where photographs can be developed without light exposure.

Definition:A room designed to exclude all light.

Example:She enclosed the sensitive documents in a lightproof envelope before mailing them.

Definition:An envelope designed to exclude all light.

Example:During the photo shoot, they used lightproof boxes to protect the negatives from direct light.

Definition:Boxes designed to exclude all light.

Example:For this darkroom session, she used a lightproof camera to ensure no light would reach the film.

Definition:A camera designed to exclude all light.