prov:value
| - Appropriate cationic crosslinking agents include alkaline earth metals, such as calcium, magnesium, barium, strontium, and beryllium ions; transition metals, such as iron, manganese, copper, cobalt, zinc, and silver ions; other metallic elements, such as boron, aluminum, lead, and bismuth ions; and polyamonium ions, such as +H3N(???H2)n???NH3 + or +H3N???(CH2)n???CH((CH2)m???NH3 +)((CH2)p???NH3 +)
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