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Prepositions with materials

Of iron, in iron, or with iron?

These phrases have different meanings. Of iron describes material, in iron describes style or covering, and with iron usually refers to using iron as a tool or substance.

Quick answer

How to use iron with prepositions

Use of iron for material, in iron for artistic style or covering, and with iron for actions done using iron.

The gate is made of iron.
The statue was cast in iron.
The worker cut the bar with iron tools.

Choose the pattern by meaning

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

1
made of iron

Describing material

Of iron identifies what something is made from.

The fence was made of iron.
They discovered a box of iron underground.
2
cast in iron

Describing artistic or manufacturing form

In iron is used for sculptures, designs, or objects produced in the material.

The figure was cast in iron during the 19th century.
The pattern was reproduced in iron.
3
with iron tools

Showing the instrument or means

With iron introduces the tool or material used in an action.

The blacksmith worked with iron every day.
The surface was reinforced with iron bars.

See the difference in context

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

Construction
Example
Meaning
of iron
The bridge is made of iron.
Shows the material something consists of.
in iron
The sculpture was created in iron.
Describes artistic medium or material form.
with iron
They strengthened the door with iron.
Shows the material or tool used to do something.

Common mistakes

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

Using in iron for basic material description

For ordinary material description, made of iron is more natural.

✕ The gate is made in iron. ✓ The gate is made of iron.

Using of iron for tools or means

Use with iron when iron is the instrument or added material.

✕ They reinforced the wall of iron bars. ✓ They reinforced the wall with iron bars.

Confusing artistic medium and composition

In iron often refers to artistic or manufacturing style, not simple composition.

✕ The spoon is in iron. ✓ The spoon is made of iron.

Quick practice

Choose the expression that matches the intended meaning.

1. The fence is made ___ iron.
2. The statue was cast ___ iron.
3. They strengthened the roof ___ iron beams.

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Frequently asked questions

What is the difference between of iron and in iron?

Of iron describes material composition. In iron is more common for artistic, decorative, or manufacturing contexts.

Can with iron describe tools?

Yes. It often introduces the tool or material used in an action.

Is made in iron correct?

It can appear in specialised artistic or manufacturing contexts, but made of iron is more natural for general description.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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