Abstract: A refillable container that includes: an inner container; a support member configured to support the inner container; and a cover having a tubular shape, which is fitted, from above the inner container, to an outer periphery of the inner container supported on the support member so as to accommodate the inner container therein, and is fitted to the support member. The support member includes: a support base portion including a tubular leg portion and having a raised bottom; and a support frame portion, which is provided on an upper surface of a bottom plate of the support base portion, and is configured to support the bottom of the inner container. The support base portion includes a seat step portion on which an opening end of the cover fitted to the support member is seated. The cover is made of hard plastic, and the support member is made of soft plastic.

Abstract: In a thermal recording sheet including a substrate having thereon a thermal color developing layer containing colorless or pale colored basic achromatic dye and an organic color developer, the thermal color developing layer contains aluminium hydroxide and a urea-formaldehyde resin pigment. The thermal recording sheet is small in abrasion of the recording head and adherence of depositions to the head even after long-run recording, and friction staining in unrecorded portion due to the recording head and change in gloss in unrecorded portion during recording are small.

Abstract: In an optical recording sheet having a thermal recording layer containing a colorless or pale colored dye precursor and a color developer reactable with the dye precursor upon heating to develop a color, a dimerized or trimerized urea compound is used as the color developer to obtain an optical recording sheet which is superior in ground color stability and an optical recording sheet having a reversible recordability.