DETAILED DESCRIPTION What is claimed is: 1.
The complexes of the alkali metals salts of 3,3',4,4' benzophenone tetracarboxylic acid in which the alkali metal salt is complexed with from 0.
5 to 25.
0 mol percent of the metals present of a water-soluble salt of a polyvalent metal cation selected from the group Cu.
sup.
++, Be.
sup.
++, Mg.
sup.
++, Ca.
sup.
++, Sr.
sup.
++, Ba.
sup.
++, Zn.
sup.
++, Cd.
sup.
++, Al.
sup.
+++, Cr.
sup.
++, Mn.
sup.
++, Co.
sup.
++, and Ni.
sup.
++ and in which each 15% of alkali metal salt is complexed with from 2 to 10% by weight of a polymer which has repetitive carboxyl groups whose acidic hydrogens have been replaced by alkali metal cations.
2.
A mixed crystal alkali metal salt complex as defined in claim 1 in which the alkali metal salts of 3,3',4,4' benzophenone tetracarboxylic acid, comprising the various salts of the various alkali metals comixed in any ratio as is consistent with the fundamental nature of mixed crystal salts, is complexed with from 0.
5 to 25.
0 mol percent of the metals present of a water-soluble salt of a polyvalent metal cation selected from the specified complexing group, and in which each 15% of the alkali metal salts is complexed with from 2 to 10% by weight of a polymer which has repetitive carboxyl groups whose acidic hydrogens have been replaced by alkali metal cations having the same ratio in which they are present in the mixed crystal benzophenone salt, and the combination is admixed with an effective stabilizing amount of a drainage stabilizer which creates a nondraining structure when a solid film of the mixed salt is exposed to an ambient humidity sufficiently high to cause deliquescence, the drainage stabilizer being present in an amount from 0.
25 to 16 mol percent of the metals present.
3.
A salt as described in claim 1 in which the salt is distributed upon a high surface area inorganic compound so as to create a permeable system.
4.
A salt as described in claim 1 in which particles of the salt are distributed among silane coated high surface area inorganic compounds so as to create a permeable system
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Molecular Biology 
