DETAILED DESCRIPTION What is claimed is: 1.
A reusable warmer comprising a flexible container, and located within said container, a supercooled salt solution of sodium acetate, an activator for initiating crystallization of said supercooled salt solution of sodium acetate, and a gelling agent, said gelling agent being present in sufficient quantity to convert said salt solution to a gel which remains deformable after crystallization of said salt solution.
2.
The reusable warmer of claim 1 wherein the gelling agent is a non-ionic, water-soluble hydroxyethylcellulose polymer.
3.
The reusable warmer of claim 1 wherein the gelling agent is selected from the group consisting of cellulose ethers.
4.
The reusable warmer of claim 3 wherein the gelling agent is selected from the group consisting of methylcellulose, hydroxypropyl cellulose, methylhydroxypropyl cellulose, polypropyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxypropylmethyl cellulose, hydroxyethyl propylcellulose, and hydroxybutyl methylcellulose.
5.
The reusable warmer of claim 1 wherein the gelling agent is selected from the group consisting of starch graft copolymers.
6.
The reusable warmer of claim 1 wherein the gelling agent is selected from the group consisting of natural and synthetic gums.
7.
The reusable warmer of claim 6 wherein the gelling agent is selected from the group consisting of Irish moss, gum tragacanth, viscarin GMC, kappa- and iota carrageenan, sodium alginate, guar, hydroxypropyl guar, carboxymethyl-hydroxypropyl guar, hydroxy ethyl guar, alginates, carrageenan, xanthan gum, gelatin, agarose, gum arabic, carob, tragacanth, locust bean gum, karaya, pectin, agar, gum acacia, tara gum, polysuccrose, polyglucose, and zooglan.
8.
The reusable warmer of claim 1 wherein the gelling agent is selected from the group consisting of synthetic polymers and copolymers which are hydratable and cross-linkable in solution.
9.
The reusable warmer of claim 8 wherein the gelling agent is selected from the group consisting of polyacrylates, polymethylacrylates, polyacrylamides, acrylamide methyl propane sulfonic acid copolymers, polyvinyl alcohols, maleic anhydride-based copolymers, polyvinyl pyrollidone, polyvinyl alcohol, polyacrylic acid, copolymers of acrylic acid and a polyallyl sucrose, polyoxyethylene-polyoxypropylene diol block copolymers carboxypolymethylene, and polyacrylamide
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Screen Walls 
