INBDE (Integrated National Board Dental Examination) Practice Exam

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What substance is used as a tanning agent to harden and preserve the emulsion?

Potassium Bromide
Aluminum Salts
Sodium Chloride
Calcium Carbonate

The correct answer is: Aluminum Salts

Aluminum salts are used as a tanning agent to harden and preserve the emulsion. Potassium bromide and sodium chloride do not have the properties necessary for tanning. Calcium carbonate can be used as a pH stabilizer, but does not function as a tanning agent.