Abstract: In an instant film pack of the type comprising a parallelepipedal housing having a top wall in which an exposure aperture is formed and a front end wall with a film unit exit slot through which an instant film unit is withdrawn, a supporting member is provided to prevent the film unit from being improperly withdrawn. The supporting member comprises a flexible resilient member attached to the bottom of the film pack at the front end and extending in the direction of withdrawal of the film unit. The flexible resilient supporting member is so disposed as to leave a distance of 0 to 6 mm between its front end and the slot defined between an edge controller and a front edge of a guide member of a pack holder in which the film pack is loaded for use.

Abstract: A peel-apart instant film unit including two separate sheets comprising a photosensitive sheet and an image-receiving sheet, has a coloring member provided on one end of the photosensitive sheet so as to contact a developer reagent spread between the two sheets for processing. The coloring member is adapted to change in color upon the completion of the processing of the film unit as a result of the chemical reaction of the coloring member brought into contact with the developer reagent. The color change of the coloring member, which is observed from the outside of the film unit, indicates the completion of the processing of the film unit. The coloring member includes a time delay substance that initially separates the reagent spread between the sheets, from the substance that changes color. That time delay substance is permeable by the reagent at a rate such that the reagent reaches that substance and causes the color change only upon the completion of the development of the film unit.