AURUNA® 556 EF-24 Fine Gold Electrolyte for Electroforming

Electrolyte for fine gold hollow jewellery

AURUNA® 556 EF-24 is particularly suitable for electroforming. The electrolyte produces hard, semi-bright, thick gold layers. It is mainly used to produce high quality hollow jewellery with layers between 150 and 200 micrometer. Mandrels may be either made of wax or metal. The excellent hardness up to 200 HV and more than 99.9 percent fineness ensure customer satisfaction, because the hollow jewellery offers outstanding stability in use. It can be polished easily, has good surface quality and convinces with its solder properties.

AURUNA® 556 EF-24 is also ideal when thick fine gold layers are deposited on (non-) precious metals. Creative combinations allow completely new designs.

Electrolyte characteristics

Electrolyte type


Metal content

12 (12 - 20) g/l Au

pH value

6 (5.8 - 6.2)

Operating temperature

45 °C

Current density range

0.5 A/dm²

Plating speed

0.23 μm/min

Deposition rate

85 - 90 mg/Amin

Anode material

Pt-Ti (type PLATINODE® Pt-Ti)

Coating characteristics


Fine gold


99.9 wt. % Au

Colour of deposit





200 HV

Max. coating thickness

Several 100 μm

Density of the coating

Approx. 19.0 g/cm³


  • 24 ct fine gold electrolyte for electroforming
  • Suitable for wax and metal mandrels
  • Layer thicknesses between 150 and 200 micrometer
  • High hardness up to 200 HV at 99.9 percent fineness


  • Electroforming
  • Hollow jewellery
  • Noble jewellery
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Questions about the product?

Markus Legeler

+49 7171 607 204

For inquiries and additional information
please contact

Umicore AG & Co. KG
Rodenbacher Chaussee 4
63457 Hanau-Wolfgang

Tel.: +49 (6181) 59 6005
Fax: +49 (6181) 59 2970

The information and statements contained herein are provided free of charge. They are believed to be accurate at the time of publication, but Umicore makes no warranty with respect thereto, including but not limited to any results to be obtained or the infringement of any proprietary rights. Use or application of such information or statements is at the user´s sole discretion, without any liability on the part of Umicore. Nothing herein shall be construed as a license or recommendation for use, which infringes upon any proprietary rights. All sales are subject to Umicore´s General Conditions of Sale and Delivery.