Hardeners, how do they work?

I have need for information about hardners, the purpose they serve, conditions under which they should be used (and not), how the process of hardening works, and by what criteria hardeners are measured. Is a hardened emulsion one with a lower water content? How do various hardening agents actually work to produce a hardened emulsion?

If you could I'd appreciate pointing me any technical information about how the hardening process works (chemistry, rate of hardening effects, proper use, alternate hardening processes, etc.)

Thanks

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