RUTHUNA® 479 Black Ruthenium Electrolyte

For black decorative coatings - ideal as a perfect final finish

RUTHUNA® 479 Black is the perfect final finish for dark to black surfaces for decorative applications. The black ruthenium electrolyte is strongly acidic and has a long lifetime. It is easy to operate and primarily used for rack plating.

Depending on the degree of blackening, the abrasion resistance of the layers is good to very good. Applying a strike gold layer as an undercoat is strongly recommended. If palladium-nickel or palladium are used as undercoats, strike gold plating will partly not be necessary.

RUTHUNA® 479 Black is suitable for many decorative applications, for instance in the jewellery, bathroom fittings, spectacle frame and writing utensils industries.

Electrolyte characteristics

Electrolyte type

Strongly acidic

Metal content

5 (2 - 10) g/l Ru

pH value

1.2 (0.8 - 1.3)

Operating temperature

65 (60 - 70) °C

Current density range

1.5 A/dm²

Plating speed

0.12 μm/min

Anode material

Pt/Ti or MMO (type PLATINODE® 177)

Coating characteristics


Black ruthenium


99.9 wt.% Ru

Colour of deposit

Grey to anthracite (black)




  • For perfect decorative dark to black final finishes
  • Degree of blackening adjustable
  • Good colour constancy
  • Strongly acidic electrolyte with long lifetime
  • Simple bath maintenance
  • Good to very good abrasion resistance
  • Suitable for rack and barrel


  • Accessories
  • Bathroom fittings
  • Spectacle frames
  • Jewellery
  • Writing implements
  • Watches
  • Car interiors
  • Shop furnishings

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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.