Jaune mousseux: what the name says, what seizures show

Both words describe what the buyer sees and touches. "Jaune" refers to a pale shade, beige to blond, which the market associates with a fine sift of fresh trichomes. "Mousseux" refers to a soft, airy paste that crumbles between the fingers and swells or bubbles when heated. In the unofficial ranking of street hash, sellers use these two signs to charge more.

A resin's colour depends on the sift, and also on the variety, oxidation, age and pressing, as our article on resin colour explains. None of these signs replaces a test. Without analysis, neither the shade nor the reaction to a flame reveals the THC content or the presence of a cutting agent. Modern names such as frozen, piatella or 120u work the same way: our comparison of hash names shows that a name describes a method and never a strength.

Nor can the Moroccan origin claimed by sellers be checked. Traditional Rif sifting, described in our article on Moroccan hash, is used as a brand image for products whose real origin nobody knows.

Public data cover the market as a whole and give no figure for a trade name. According to the French Monitoring Centre for Drugs and Drug Addiction (OFDT), the average THC content of resin went from 12.3% in 2011 to 29% in 2023. Herb went from 10.4% to 14.0% over the same period. Resin still sells on the street for about €8 a gram.

Behind an average of 29% lie wide gaps between samples. For someone used to a weaker resin, the same amount can deliver twice the THC.

The second risk is invisible. In February 2021 the OFDT's SINTES system published a note on adulterated herb and resin. It described products with very little THC, sprayed with synthetic cannabinoids and sold as ordinary cannabis. These molecules act at very low doses that are hard to control. They are described in our article on the "pète ton crâne" products, and the one on cut hashish explains why looking at a piece tells you nothing.

Jaune mousseux is a THC cannabis resin, which makes it a controlled drug. Article L3421-1 of the Public Health Code punishes use with one year in prison and a €3,750 fine. Since 20 August 2026, prosecution can be closed with a €500 fixed penalty, cut to €400 for quick payment and raised to €1,000 for late payment. Buying, holding and selling are punished more heavily.

CBD hash comes under another framework. It is made from hemp varieties listed in the catalogue, and the order of 30 December 2021 caps Δ⁹-THC in the product at 0.30%. Where that figure comes from, and how it is measured, is explained in our article on the legal THC limit.

Phytogrammes sells no controlled product, and this section does not explain how to use one. For anyone who uses street hash regardless, four facts matter.

1. Appearance gives no indication of strength: a pale, soft resin may be much weaker, or much stronger, than the 29% average.
2. If the strength doubles, so does the dose. With the same amount, the unwanted effects of high THC doses (anxiety, palpitations, feeling faint) become more likely.
3. Synthetic cannabinoids are invisible, and only a laboratory analysis identifies them.
4. If someone feels unwell, call 15, the French emergency medical number, and say what was taken; health workers are bound by medical confidentiality. For a non-urgent question, Drogues Info Service answers free of charge on 0 800 23 13 13, 7 days a week.

Driving after THC use is an offence whatever the amount. The known detection windows are listed in our guide to saliva testing.

What jaune mousseux reveals is a demand for craft resins, finely sifted and aromatic. Legal hemp uses the same techniques: dry sifting, ice-water separation, hot pressing. Our hashish lexicon entry defines the vocabulary.

What differs is what can be checked. Three lines on the analysis of a CBD hash batch are enough: Δ⁹-THC below 0.30%, THCA, and no HHC, H4CBD or THCP where the laboratory tested for them. Our guide to reading a certificate of analysis goes through them one by one.