You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

These substances are broken apart when ferric chloride turns into ferric hydroxide in the presence of water. One type of these substances can be produced by Bredig's Arc Method, and, when they contain water, peptization can be performed. Adding surfactants stabilizes one type of these substances, which generally scatter light in the (*) Tyndall Effect. Particles from these substances aggregate in flocculation, and specific types of them include gels and emulsions. For ten points, identify these substances like blood and milk, in which small particles are dispersed, but not dissolved, in a continuous phase.
Output:
Science