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Prepositions after adjectives

Pure in vs. pure of

Pure of often means free from something. Pure in describes an area or quality.

Quick answer

Main uses

Use pure of for freedom from unwanted qualities. Use pure in for a quality or aspect.

The water is pure of contaminants.
Her style is pure in tone and structure.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
pure of + unwanted thing

Free from something

Of introduces what is absent.

The air was pure of smoke.
2
pure in + quality

Pure regarding an aspect

In introduces the area or quality discussed.

The design is pure in form.
3
pure at heart

Fixed expression

Some expressions use other prepositions idiomatically.

She remained pure at heart.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
pure of
The product is pure of artificial colours.
free from something
pure in
The melody is pure in tone.
pure regarding an aspect
pure with
The room was pure with light.
not a standard pattern with pure
pure from
The water is free from chemicals.
free from is often more natural

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using with after pure

With is generally unnatural after pure.

✕ The milk is pure with additives. ✓ The milk is pure of additives.

Confusing pure and purely

Pure is an adjective; purely is an adverb.

✕ The material is purely in colour. ✓ The material is pure in colour.

Overusing pure of

Free from is often more natural in everyday English.

✓ The food is free from preservatives.

Quick practice

Choose the expression that matches the intended meaning.

1. The water is pure ___ chemicals.
2. The sound is pure ___ tone.
3. Which phrase is most natural?

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Frequently asked questions

Is pure of common?

It is grammatical but somewhat formal. Free from is often more common.

What does pure in mean?

It means pure regarding a quality, aspect, or field.

Can pure be used without a preposition?

Yes. For example: pure water or pure gold.

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