What does heroin look like?

Heroin appears as brown powder, as white or off-white powder, and as a sticky dark solid, and the differences mostly reflect where it was made and how it was processed. None of the variation addresses the thing that has changed the risk in recent years, which is what else is in it.

The forms it comes in

The table below lists the shapes heroin turns up in and what each one actually indicates, which is usually something about processing rather than about quality.

Forms of heroin, and what each one does and does not indicate

Form	What it looks like	What it tells you
Brown powder	Tan to dark brown, coarse	Base form, common in Europe
White powder	Off-white, fine	Salt form, dissolves more readily
Sticky solid	Dark, tar-like	Different processing, less common in Europe

Colour

Brown is usual in Europe and reflects the processing route rather than quality. Whiter material is not automatically purer, since several common cuts and several dangerous adulterants are white. Colour here describes origin and processing, not strength.

Texture and shine

Coarse or fine, sticky or dry, all follow from processing and storage. Paracetamol and caffeine are frequent additions and are invisible once mixed. Nothing in the texture distinguishes a heavily cut sample from a strong one.

What looks the same

The important one cannot be seen at all. Fentanyl and nitazenes are active at amounts far below what is visible, so a sample containing a lethal quantity looks exactly like one that does not. They are also distributed unevenly, so one part of a bag can differ from another.

What the look does tell you

Very little, and it is worth being direct about that rather than implying otherwise. Vinegar smell, clumping and colour all describe processing. None of them address the adulterants that account for the deaths.

Where looking stops

Nothing above identifies a substance. Appearance cannot tell you which molecule you have, it cannot tell you how much of it is there, and it cannot see the cuts, because the things added to heroin are chosen partly for looking like it. Two samples that look identical can be different substances at different strengths.

That is not a reason to give up on knowing. It is the reason chemistry exists, and the steps are quick. A reagent answers what the substance is. A testing card separates the sample and shows what else is in there along with a rough percentage. A laboratory analysis gives you an exact figure when the answer has to be exact.

For identity and cuts on your own sample, the first link below. The second puts a number on it. The third is the full laboratory analysis for when an estimate is not enough.

Heroin harm reduction guide · Which test do you need? · What a testing card does

Questions?

Is white heroin stronger than brown?

Not reliably. The colour reflects processing route and origin rather than strength.

Can I see fentanyl in it?

No. It is active in amounts far too small to be visible, and it is not mixed evenly.

Does the smell tell me anything?

It tells you about processing residues. It does not address what was added later.

What actually helps?

Strips for fentanyl and nitazenes, because those sit below what a reagent or a testing card can resolve, plus a reagent for what the bulk is.