These liquitabs work by using a water soluble pva casing which dissolves when water is added, the liquid inside contains long polymer chains and so does not dissolve the casing. This would not be suitable for use with gravy as the tap would dissolve too readily, but a heat activated tab is another matter. A heat activated tab could be placed onto any plates requiring gravy prior to cooking.
Why not just use a gravy boat? Gravy boats may be fine for family meals but in a kitchen environment they do not hold enough liquid nor do they retain heat well enough, there is also the matter of "skin" which will inevitably form on the top. Gravy liquitabs would reduce cost by ensuring only those who require gravy will be given it.
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