What are the two kinds of post-emulsifiable penetrants?

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Multiple Choice

What are the two kinds of post-emulsifiable penetrants?

Explanation:
Post-emulsifiable penetrants are designed to be removed after a penetrant dwell by an emulsification step. There are two kinds: lipophilic (oil-based) emulsions and hydrophilic (water-based) emulsions. The difference lies in what they dissolve in and how they are removed — lipophilic emulsions use oil-based emulsifiers to emulsify and are then rinsed, while hydrophilic emulsions use water-based emulsifiers with a water rinse. This distinction is why the two kinds are described as lipophilic and hydrophilic post-emulsifiable penetrants.

Post-emulsifiable penetrants are designed to be removed after a penetrant dwell by an emulsification step. There are two kinds: lipophilic (oil-based) emulsions and hydrophilic (water-based) emulsions. The difference lies in what they dissolve in and how they are removed — lipophilic emulsions use oil-based emulsifiers to emulsify and are then rinsed, while hydrophilic emulsions use water-based emulsifiers with a water rinse. This distinction is why the two kinds are described as lipophilic and hydrophilic post-emulsifiable penetrants.

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