Question 1

What is Chevreul's Salt and what is its chemical formula?

Accepted Answer

Chevreul's Salt is copper(I,II) sulfite dihydrate — a mixed-valence copper sulfite with the chemical formula Cu₂SO₃·CuSO₃·2H₂O. It is a stable, brick-red crystalline copper compound first described by French chemist Michel-Eugène Chevreul, and is widely used today as a slow-release copper micronutrient and as a precursor in copper-based crop protection.

Question 2

How does Chevreul's Salt help with copper deficiency in plants?

Accepted Answer

Copper deficiency in plants causes wilting, chlorosis of young leaves, poor grain set in cereals, dieback of shoot tips and reduced lignification. Chevreul's Salt corrects this deficiency by supplying bio-available Cu⁺ and Cu²⁺ over an extended window — restoring chlorophyll synthesis, lignin formation, pollen viability and disease resistance, especially on peat, sandy and high-pH soils where copper is most often deficient.

Question 3

How is Chevreul's Salt different from copper sulfate or copper oxychloride?

Accepted Answer

Copper sulfate (CuSO₄·5H₂O) is highly water-soluble and releases all its copper at once, with a higher risk of leaf burn and leaching. Chevreul's Salt is a copper sulfite that is practically insoluble in water, so copper is released slowly as the sulfite slowly oxidises in soil — giving longer residual nutrition with less phytotoxicity and lower environmental Cu loading per season.

Question 4

What grades of Chevreul's Salt do you supply?

Accepted Answer

We supply Agricultural Grade (≥97%), Technical Grade (≥98%) and Reagent Grade (≥99%) Chevreul's Salt. Each grade is shipped with a Certificate of Analysis (CoA) and full MSDS, and is suited respectively for crop nutrition, copper fungicide formulation and laboratory / electronics use.

Question 5

What is the recommended dosage of Chevreul's Salt in agriculture?

Accepted Answer

As a general guide: soil application 1–3 kg/ha as a corrective copper dose every 3–4 years, or foliar sprays at 0.05–0.15% solution depending on crop. For cereals on copper-deficient soils, a 1–2 kg/ha basal dose is typical; for vines, citrus and olives, foliar 0.10–0.15% is common, observing the EU cap of 4 kg Cu/ha/year. Always follow the technical data sheet and local agronomy advice.

Question 6

Is Chevreul's Salt approved as a copper micronutrient in the EU and USA?

Accepted Answer

Copper compounds — including copper sulfite chemistry — are recognised as crop nutrients and crop-protection inputs in both the EU (under EC fertilizer regulations and the EU plant protection regime) and the USA (EPA-registered copper actives). Chevreul's Salt is supplied for formulators and growers to use within those frameworks; the end product registration depends on your formulation and label claim.

Question 7

Can Chevreul's Salt be used as a copper fungicide raw material?

Accepted Answer

Yes. Technical-grade Chevreul's Salt is used as a precursor for copper fungicide and bactericide formulations targeting downy mildew, fire blight, bacterial spot and similar diseases on grapes, citrus, tomatoes, potatoes and stone fruit. Its slow-release behaviour helps formulators achieve comparable disease control with lower elemental copper loading.

Question 8

How should Chevreul's Salt be safely stored and handled?

Accepted Answer

Handle with nitrile gloves, safety glasses and a dust mask. Store in tightly closed HDPE bags or fiber drums in a cool, dry, well-ventilated area below 35 °C, away from acids and strong oxidisers. Avoid prolonged exposure to moisture and direct sunlight. Shelf life is typically 24 months in original sealed packaging.

Question 9

Can Chevreul's Salt be used on organic farms?

Accepted Answer

Copper inputs are permitted in many organic standards within annual limits (e.g. the EU caps total Cu at 4 kg/ha/year averaged over 7 years; USDA NOP allows copper materials with restrictions). Chevreul's Salt's slow-release behaviour helps growers stay within those limits while still correcting copper deficiency.

Question 10

What packaging and export terms are available?

Accepted Answer

Standard packaging is 25 kg HDPE bags with inner LDPE liner, palletised and shrink-wrapped. Bulk 500 kg / 1000 kg jumbo bags are available on request. We export Chevreul's Salt globally — Europe, USA, Latin America, Middle East, Africa, South-East Asia and Oceania — under FOB, CIF and CFR Incoterms with full documentation.

Property	Specification
Chemical formula	Cu₂SO₃·CuSO₃·2H₂O
Appearance	Brick-red crystalline powder
Copper content (Cu)	≈ 50–53% w/w
Bulk density	1.4–1.6 g/cm³
Solubility in water	Practically insoluble (slow release)
Shelf life	24 months in sealed packaging

Chevreul's Salt — slow-release copper for healthier crops.

Benefits for agriculture and industry.

Corrects copper deficiency

Slow, gentle release

Cleaner crop protection

Stable & shelf-friendly

Three grades — agricultural, technical and reagent.

Agricultural grade

Technical grade

Reagent grade

How to use Chevreul's Salt in the field.

Specifications, dosage, safety & supply — Chevreul's Salt FAQ.

Explore copper deficiency, fertilizer types & application guidance.

Copper deficiency in plants — symptoms & correction

Micronutrient & slow-release fertilizer types

Application guidance for copper micronutrients

PNP coated urea (Uregold) — slow-release nitrogen

Potassium nitrophenolates (PNP) biostimulant

Field studies on copper micronutrient response

Get pricing, samples & MSDS for Chevreul's Salt.