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topic 0994

Brighteners for Gold Plating

A discussion started in 1998 and continuing through 2020 so far.
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Q. I am making a brightener for a decorative gold bath, do I want to use cobalt sulfate heptahydrate or cobalt sulfate mono-hydrate?

Jerry Hammie
GPEAA, Inc. - Naples, Florida


A. I am sorry: English not perfect...

Gold plating is very kind of bath. Generally brightener is cobalt, cadmium, indium, etc.

The concentration of brightener is usually very low include.

acid type : 0.5g/l - 1g/l

EDTA 2Na is good low current part, and as Brightener react. Organic brightener is not used yet.

Welcome to Korea 2002 world cup games...

Thank you

Kyuong min, KIm
platech - suwon(2002 Worldcup game state), Korea

To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)


Q. I am using a citric acid gold bath, I want to make my own brightener using EDTA and Cobalt, but I need a formula for the brightener. Help!

Jerry hammie
- Gold Plated Emblems

August 12, 2011

A. Cobalt sulphate 9 gram, and edta 15 gram, and indium sulphate 0.4 gram

Majed Ja
- Bethlehem Palestine


Q. I was wondering what citric acid does in the formula when making a bath? Also I was wondering how I can find this. I was also wondering if there is a substitute that I can use? Please help me find this and any other useful information on this topic. I will give the recipe to anyone who responds. Thank you.

Kim A [last name deleted for privacy by Editor]
- McCord, Saskatchewan, Canada

affil. link
"Gold Plating Technology"
by Reid & Goldie
from Abe Books

A. Hi Kim. See if a library has Reid & Goldie "Gold Plating Technology". It covers everything about gold plating.

sidebar There's nothing wrong with wanting to privately exchange information with someone, but this isn't the site for it. We're not a matchmaking service for individuals to barter their knowledge with each other; we're here for Public education. Anything anyone wishes to share is posted for all to share.

Luck & Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

2000 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hello please send me the latest formulas of the best ways for gold plating and chrome plating if required. If you have any books about this subject please send me.

Khaled Sibai
- Suadi arabia

A. Hi Khaled. I suggested an excellent gold plating book above. For chrome plating I suggest your start with our "Introduction to Chrome Plating".

Luck & Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


Q. I would like to know the formula for citric acid.

Megan Smith
- Atco, New Jersey


A. citric acid = C3H6O3

Rishi Aggerwal
- India


A. citric acid= C6 H8 O7

Samira [last name deleted for privacy by Editor]
- Phoenix, Arizona, USA

November 28, 2020 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hello,
I currently work in a small plating shop doing hard gold plating on kovar pins, copper, nickel, gold.

We don't have access to any type of analysis, our problem is our gold looks really good for the first 5 or 6 minutes of plating then it starts to get really dull after that; we usually plate for 10 minutes.

Bill Coppell
- Alvin Texas

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