# Jewelry workshop chemistry: pickle, flux, patinas and what not to mix

> The chemicals of a jewelry workshop (pickle, flux, liver of sulfur, degreasers, plating baths) and which products must never be mixed.

- Source: https://www.711grados.com/en/jewelry-workshop-chemistry/
- Language: en
- Note: This entry was drafted with the help of AI and is pending review by the author.
- Published: 2026-08-29
- Updated: 2026-09-03
- Translation (es): https://www.711grados.com/es/quimica-del-taller-de-joyeria/
- Author: Sandra Sánchez
- Site: 711 Grados (https://www.711grados.com/)

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A jewelry workshop uses products that clean, protect or color metal. It is worth knowing what each one does and how to handle it. **Workshop safety** (equipment, ventilation, ergonomics) is covered on [its own page](https://www.711grados.com/en/workshop-safety/); this one is about the chemistry.

## Vocabulary

- **Flux (fundente):** protects the metal from oxygen during soldering. See [flux](https://www.711grados.com/en/flux-for-soldering/).
- **Borax (bórax):** traditional flux.
- **Pickle (decapante):** a mild acid bath, often sodium bisulfate or citric acid, that dissolves oxide after heating. See [pickling](https://www.711grados.com/en/pickling-metal/).
- **Acid (ácido):** a substance that attacks metal; in the workshop, those used for pickling, etching or refining. See [etching](https://www.711grados.com/en/etching-and-photoetching/).
- **Neutralization (neutralización):** reducing the acidity of a used bath, for example with baking soda, before disposing of it according to local rules.
- **Patina (patina):** a layer of color on the metal. See [coloring](https://www.711grados.com/en/coloring-of-metals/).
- **Sulfide (sulfuro):** a sulfur compound; liver of sulfur (potassium sulfide) darkens silver and copper.
- **Firescale:** a gray or purplish stain on sterling silver caused by copper oxide below the surface after unprotected heating. It is prevented with flux or an anti-firescale coating, short heating and a [neutral or reducing](https://www.711grados.com/en/torch-flame-types/) flame; it is removed by sanding or by cycles of annealing and pickling.
- **Electroplating bath (baño electrolítico, electrodeposición):** depositing a layer of metal with electric current. See [electroplating](https://www.711grados.com/en/electroplating-baths/).
- **Degreaser (desengrasante):** removes grease and dirt before soldering, patinating or plating.

## What NOT to mix

- **Bleach (chlorine) with acids or with ammonia:** releases toxic gases. Do not mix them or use them in the same container or closed area.
- **Liver of sulfur with acids or with pickle:** can release hydrogen sulfide, a toxic gas. Store and use them separately.
- **Acids with cyanides:** form hydrogen cyanide. Some old gold-plating baths contain cyanide; they are not for a home workshop. Cyanide-free alternatives exist.
- **Pickle and pieces with iron or steel:** steel tweezers in pickle plate copper onto the piece. Use copper, brass or plastic tongs.
- **Water into a concentrated acid:** always add the acid to the water, never the reverse.

## How to handle them

- Read the safety data sheet (SDS) of every product.
- Keep them labeled, closed and out of the reach of children and pets.
- Work with ventilation, glasses and gloves.
- Heat pickle in an electric pot kept just for it, never the one used for cooking, and not sealed airtight.
- Do not pour used products down the drain without knowing what your area allows.

This entry is a general guide; when in doubt, ask a professional.