If the senses directly grasp proper sensibles without error, then perceptual acquaintance constitutes a form of immediate knowledge of the causal properties producing those qualities.

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Causal properties(as used in metaphysics): Characteristics that describe how something causes or produces effects—basically, what a thing does to make other things happen.
Immediate knowledge(as used in epistemology): Knowledge you gain directly without needing reasoning, inference, or other steps in between.
Perceptual acquaintance(as used in epistemology): Direct, personal familiarity with something through your senses rather than through description or secondhand information.
knowledge(Distinguished from mere true belief, which may be the product of indoctrination and need not exercise deliberative capacities.): Justified true belief — true belief that has been arrived at through the exercise of deliberative capacities, including comparison of and deliberation among alternatives.
proper sensibles(ST 1a 78.3 ad 2): Sensible qualities that make an impression on the senses primarily and per se, each perceivable only by its corresponding sense (color, sound, odor, flavor, hot-cold).
senses(Dummett's distinction between senses and ingredient senses): The contents of expressions; the bearers of truth and falsity and the objects of propositional attitudes.

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