Rhodium Pen Plating Solution (UK and EU only)

£16.56£86.92 + VAT

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Our rhodium pen plating solution plates bright and white. One of the reasons for this is that it is free from additives whose breakdown products can cause darkening of the plate and reduce shelf life.

Please use our Fibre Nibs with our rhodium pen solution and these can be purchased HERE

This solution has an extra long shelf life of over 5 years.

Rhodium content: 20 grams per litre.

Orders outside UK and EU

This plating solution cannot be purchased and shipped outside the UK and the EU because it’s part of our range of plating solutions which are regulated for transport.

You could substitute this with our Palladium Pen Plating Solution which can be shipped outside the UK and the EU. Details of this alternative can be found by clicking HERE


Rhodium pen plating the claws on a gold ring using our Battery Powered Plating Pen fitted with our Fine Fibre Nib which has been specially developed for rhodium pen plating. For help with the technique of pen plating, click HERE to see our Electroplating Manual.

We also sell a complete Battery Powered Rhodium Pen Plating Kit. Please click HERE for details.

Features Applications Method
  • Highly reflective and corrosion resistant, lustrous appearance
  • Hardest precious metal
  • Rhodium concentration: 25 gms per litre
  • Plating over white gold alloy (typically 75% gold with balance palladium, platinum or silver) to give a brilliant finish
  • Non-tarnish coating for silver
  • To be used with our Plating Pen, not our Battery Operated Pen
  • Plate at no lower than 25 degrees centigrade.
  • If plating on to base metals and sterling silver, plate a barrier layer of palladium, white palladium or white gold.
  • Use our Fibre Nibs only.

How to use our Battery Powered Plating Pen

Our Battery Powered Plating Pen by long-life batteries with no need for a separate power source making it completely portable. When the batteries run out you can easily replace them - no need to throw the plating pen away and buy another one.
It is Ideal for plating small areas such as jewellery and electrical items such as PCBs and electrical connectors on plugs.
This plating pen can be used with our Rhodium Pen Plating Solution, as well as most of our Coloured Metal Mixers such as rose and green gold.

1. The complete Battery Pen Plating Kit

Each of our Battery Powered Pen Plating Kits include, along with the pen, Gold and Silver Pen Plating Solution, Nibs, MPU, a Beaker, a Mini Contact Probe and Conductor Strips.

For a full guide on how to set up your battery operated plating pen from new, please click HERE.


2. Preparing the surface of your work for pen plating

The surface of your work must be free of tarnish, oxides, dirt and grease to ensure a good plating result. To achieve this, use a little of the MPU on a piece of tissue paper and rub the surface of your work until the metal is shiny and you can see the true colour of the metal clearly. Please click HERE to see our section in this manual on surface preparation.

3. Preparing the pen

This is how your pen should look once it is set up. The work is held in one hand and the nib in the other end of the pen (dipped in the gold Pen Plating Solution) is gently stroked over a small area of the surface of your work. This completes the electrical circuit and gold plating takes place.

Note that the ring is not being directly held by the crocodile clip; the electrical circuit is made by the conductor strip (grasped by the crocodile clip) being held in contact with the work. This stops the steel teeth of the crocodile clip scratching the surface of your work.

The next few steps will take you through in detail how to set up your pen.

4. Preparing the plating solution

Measure out the amount of solution you need with your pipette and put it into your beaker. To work out how much plating solution you need, go to our Plating Calculator which you will find on each of our product pages. Just enter in the size of the area you want to plate and how thick you want your plated layer to be and the Calculator will tell you how much plating solution you will need and how long you’ll need to plate. You will then be able to work out in advance how much it will cost to plate your item.

Do not try to dip the pen directly into your bottle of solution as this will mean the next time you want to plate a different item, the solution in your bottle will have a lower concentration of gold and it will take longer for you to achieve a required thickness of gold plate. You will also find it impossible to use the Plating Calculator accurately and you won’t be able to estimate how much it cost to plate the item.


5. Inserting the nib into the anode

Insert a nib into the small hole in the electrode of the pen. Make sure the nib is fully pushed down into this hole and the bottom of the nib is in contact with the anode.

6. Dipping the nib into the pen plating solution

Dip the nib into the pen plating solution. Make sure the nib is fully soaked in the solution, otherwise there won’t be a complete electrical circuit when you come to plate and no plating will take place.

7. Pen plating

Now start pen plating by gently stroking the nib over a small area of your work with regular, circular movements. Keep dipping the nib in the plating solution at frequent intervals to replenish the gold in the nib. Remember to set your timer to the time the Plating Calculator gave you for plating to your required  thickness. You need to have plated the whole of the surface of your work in this time.

Once you have finished plating you can bring out the final lustre of your work and partly protect it from tarnish by applying our MetaSeal with some clean tissue.

8. Rhodium pen plating

As mentioned in the introduction, The Battery Powered Pen Plater can also be used with our Rhodium Pen Plating Solution. A slightly different approach to setting up the pen is required, because of the different composition of the Rhodium Pen Plating Solution and the Fibre Nibs that have to be used with it.

Draw out the required amount of solution from the bottle using a pipette and transfer it into the glass beaker that is supplied with our Batterery Powered Rhodium Pen Plating Kit. Using the tweezers supplied, place the fibre nib into the rhodium solution and let it soak for at least an hour so that the rhodium solution completely permeates into the fibre nib. After an hour, using your tweezers, place the fibre nib into the end of a pen. It is essential to use the tweezers as using gloved hands would cause contamination of the pen plating solution.

9. Functional applications

The Battery Powered Plating Pen is ideal for spot plating of electrical contacts on such items as PCBs and Photomultipliers. To connect the Mini Contact Probe to the black lead coming from the pen, just grip the wide end of the Probe with the crocodile clip.

10. Pen maintenance

It is very important to keep your pen in good working order every time you use it. For a full guide on how to do this, please click HERE for our Battery Powered Plating Pen Maintenance Guide.

Pen Calculator

Operating Parameters and Deposit Data


Voltage Range 4.0 – 5.0 volts
Temperature Above 20 °C
Rhodium Concentration 20 g/l
Electrode Plating Pen or Battery Plating Pen
Palladium content in plate 99.9% (balance carbon, nitrogen)
Lightness (L*) of deposit 72 – 80%
Plating Rate at (3.5 volts, carbon electrode) 0.3 micron per minute at 25 °C
Hardness 980 – 1000 Hv
Density of deposit 11.82 g/cm3
Stress Highly stressed
Special storage requirements None
Shelf life Over 5 years
Health and Safety classification Corrosive
Special considerations None
Transport (UN number) 2796 Packing Group ll

Some items are regulated for transport and can only be delivered to destinations in the UK and countries within the EU. Alternative or substitute products are detailed in the ‘Description’ tab of this tabbed panel or under Related Items below this tabbed panel.
For all price quotations for deliveries, please add your items to our shopping cart. You will be able to see the shipping costs by clicking on the ‘Calculate shipping’ button in the cart and before checking out.