Abstract: A kit for preparing a cured article may include first and second casting compositions configured to form a curable composition, and an additive delivery composition for introducing an additive into the curable composition. The additive delivery composition includes a liquid carrier and at least one additive. The liquid carrier may include one or more of polyvinyl acetate, polyvinyl alcohol, or polyacrylate. A mold assembly for preparing a cured article may include a first mold body defining a first mold chamber and a groove surrounding the first mold chamber. The mold assembly further includes a second mold body defining a second mold chamber and a tongue surrounding the second mold chamber. The tongue is receivable into the groove to secure the first and second mold bodies. The first and second mold chambers together define a mold volume configured to receive and shape the curable composition.

Abstract: A stirrer for stirring a curable composition extracted from a squeezable container may include a body extending along a stirrer axis. A slot may be defined in the body along the stirrer axis. The slot may be configured to retain or squeeze at least a portion of the squeezable container. A total length of the slot may be less than 80% of a total length of the body. The stirrer may further include a tab extending from the body, which may have a substantially polygonal contour. The slot may extend to a teardrop-shaped end facing the tab. The slot may extend along a zigzag line. The tab may be held during engagement of the squeezable container with the slot to extract the curable composition and during stirring. The body may defining a tubular section defining the slot. The stirrer may further include a scoop extending from the tubular section.

Abstract: A liquid additive delivery composition for introducing an additive into a curable silicone composition may include a liquid carrier and at least one additive. The liquid carrier may include one or both of polyvinyl acetate or polyvinyl alcohol.

Abstract: A marking composition may include an aqueous carrier and thermochromic capsules. The thermochromic capsules may include a leuco dye, an activator, and a temperature regulator. The thermochromic capsules may have a volume average size effective to resist temperature-mediated discoloration at a temperature of at least up to 40° C. by dissipating heat. In some embodiments, the marking composition marks a substrate with a substantially erasable mark, for example, in response to frictional contact with an eraser.