Do you mean this test? It certainly looks like the one you're describing except for the pink color which in this one it's more of a pink rose color than a bright pink...

http://www.elmerwallace.co.uk/23.105-Passivity-Test-Kit/99.htm

This one is the Copper sulfate test which is an alternative to the cyanide test mentioned below by Sperko Engineering:

http://www.elmerwallace.co.uk/Fast,-simple-Stainless-Steel-test-kits/Copper-Sulphate-Test/C10-117-1-0.htm

This one is really High Tech gizmo:

http://www.elmerwallace.co.uk/Passi-Test-Plus---Passivation-tester-%28click-for-video%29/175.htm

Or one of these Doo - Hickies:

http://www.vecom.nl/english/productsheets/marine/0809_oxilyser3.pdf

This the Ferroxyl Test that's very toxic and DANGEROUS and potentially Life Threatening:

Ferroxyl Solution for Finding Free Iron on Stainless Steel
Distilled Water 1 liter
Nitric Acid 30 milliliters
Potassium Ferrocyanide 30 grams<<<<EXTREME CAUTION!!! Note this method of testing is very toxic, and potentially life threatening...
DO NOT USE with any stainless steel associated for any use with foods because of the cyanide.

http://www.sperkoengineering.com/html/Rust.pdf

Another good article, or two, or three, or more:

http://innomet.nl/docs/Flashrust.pdf

http://www.euro-inox.org/pdf/map/Passivating_Pickling_EN.pdf

http://www.ssina.com/download_a_file/cleaning.pdf

http://www.cartech.com/techarticles.aspx?id=1566

http://www.aws.org/w/a/wj/2002/05/feature/

I helped to install quite a few of these amongst other brands of Cooling Towers, Closed Circuit Coolers, and Evaporative Condensers all over the Metro - New York City, Long Island, and Westchester County... Too many "lolly" columns and structural frame work to remember how many we erected to mount the units on... This is an informative bulletin:

http://www.evapco.eu/sites/evapco.eu/files/white_papers/40-Cleaning-Stainless-Steel.pdf

Good info here:

http://www.pennstainless.com/blog/tech-resources/general-product-information/corrosion-prevention/

http://www.pennstainless.com/blog/tech-resources/general-product-information/maintenance-and-repair/

http://www.pennstainless.com/blog/tech-resources/general-product-information/cleaning-stainless-steel-3/

http://www.pennstainless.com/blog/tech-resources/general-product-information/ams-cross-reference-chart/

I just thought of adding this also:

http://www.derustit.com/pdfs/CorrosionReportFlyer_v3.pdf

This stuff is fantastic but not inexpensive!

http://www.nanovations.com.au/metal.htm

There's more but, I'm going back to sleep... Best of luck.

Respectfully,
Henry

You did not mention which standard you are required to comply with.

The American Society for Materials/Metals (ASM) or ASTM can probably give you some useful information - as well as some of the major stainless supplies - like Carpenter Technology...???