Gold Plating Services’ 24K Pure Brush Gold / Pure Pen Gold Solutions are extremely efficient (cathode efficiency 98%+), neutral pH, water-clear gold plating solutions designed to produce a gold electro-deposit of 99.9%+ purity to virtually any desired thickness for surfaces in the medical, semiconductor, electronic, and PWB industries where soft, high purity gold is required. Due to the grain structure of this type of gold deposit, the reflective qualities of the surface will become noticeably matte with increased thickness.  

These solutions are fabricated with a purity and hardness of electrodeposited gold that meets Type III, Grade A specifications, as indicated in MIL-DTL-45204D as follows:

Gold Content - Varies between solution type and volume
Purity - 99.9+ percent gold minimum (24 karat) 
Hardness - Knoop hardness < 90 (typically 55-60)
Density of Plate12.45 mg/in²/µm thick
Theoretical Coverage - 1 gram of fine gold has a coverage of about 400in² with the gold plated to an average decorative thickness.

Note: This coverage is based on the assumption that all gold in the solution will be deposited. In actual practice this is not likely since there is normally solution loss during use. 

Usage Notes:

  • Brush and Pen plating produce a plate that is not as consistent across the surface as bath plating. The deposit is affected by voltage, current, how much gold is in the sleeve, speed and pattern of movement across the surface, and the type of area/surface it is applied to.
  • The best way to determine how much solution to use is by calculating surface area, then determining how much gold is needed to achieve the desired thickness of the gold plate. Make sure to use up that entire amount of solution within that surface area. 
  • When planning a project, account for solution loss. This occurs through solution that drips from the item and the handle as well as unintentional over-deposits in certain areas.
  • A dark or dull gold deposit referred to as "burning" is caused by too high of a voltage or by moving the sleeve or tip too slowly while plating. It can be easily polished off with a soft cloth or a paste made of baking soda and water.

Operating Conditions

Temperature  Room  

Anode / Application Tip -   Pen: Felt Tip - fine or medium
Brush: Platinized Titanium Bit with a Cotton Sleeve
Note: Ensure sleeves and tips are thoroughly soaked prior to use.

Voltage  Pen: 3 - 5 Volts 
Brush: 2 - 4 Volts
Caution: Very sensitive to voltage. Start voltage low and work up; voltage varies based on item size and speed of movement.

Agitation -   Continuous solution movement over surface

Hardness -   60 - 80 Knoop

Shelf Life  If stored at room temperature, properly sealed solution has a shelf life of ~2 years.

Read and understand SDS sheets before using. For professional use by trained technicians only.