# Full melt

> Full melt is the highest grade of solventless hash, so pure in trichome heads that it melts almost completely with little or no residue when heated.

- Canonical: https://genetixbay.com/knowledge/glossary/full-melt.html
- Also written: full-melt, full melt hash, FMH, six-star hash, 6-star
- Glossary category: Processing · Evidence: Grower practice
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

Full melt is a quality grade, not a method. It describes [ice water hash](https://genetixbay.com/knowledge/glossary/bubble-hash.md), and occasionally exceptional [dry sift](https://genetixbay.com/knowledge/glossary/kief.md), consisting almost entirely of intact [trichome heads](https://genetixbay.com/knowledge/glossary/trichome-heads.md) with very little stalk, leaf or other plant matter. Heated, it liquefies and vaporises leaving minimal ash or char. Growers often grade [hash](https://genetixbay.com/knowledge/glossary/hash.md) on an informal star scale, and full melt corresponds to the top, five- to six-star end.

## In practice

Only a small share of any wash reaches full-melt quality, and some cultivars almost never produce it, because their heads are small, fragile or stick tightly to plant tissue. Hash makers therefore talk about "washers": cultivars that release large, sturdy heads in ice water. Full melt is commonly consumed as is, rather than pressed into [rosin](https://genetixbay.com/knowledge/glossary/rosin.md). The grading scale is informal and not standardised; two makers' "six stars" may differ.

## Don't confuse with

- **Melt (half melt)**: lower grades that partly melt and leave residue.
- **Rosin**: a pressed oil, not a hash grade.
- **Full spectrum**: a marketing label for extracts with broad compound profiles, unrelated.

## Related terms

[Bubble hash](https://genetixbay.com/knowledge/glossary/bubble-hash.md), [Kief](https://genetixbay.com/knowledge/glossary/kief.md), [Trichome heads](https://genetixbay.com/knowledge/glossary/trichome-heads.md), [Micron bags](https://genetixbay.com/knowledge/glossary/micron-bags.md), [Solventless](https://genetixbay.com/knowledge/glossary/solventless.md)

## Sources

1. Clarke RC. 1998. Hashish! Red Eye Press, Los Angeles (updated edition 2010).