I think he means EKC production
Your stools surface appears not to be brushed stainless steel, but rather the EKC plated steel in reference to Yago 7 post.
I was lucky enough to purchase six pieces of PK pieces from a architect who purchased them along with herman miller furniture at the same time in the early 1970s. They were pairs of PK22s chairs, PK33s stools and PK 71 nesting tables. Chairs and stools were marked EKC and the nests were marked only denmark. They all had lots of rust freckles, which i notice the FH never seem to have.
Was perusing some Kjaerholm EKC / Fritz Hansen photos online recently, and came across this interesting photo of a Fritz Hansen sticker and impressed stamp in a frame that has heavy rust pitting. As noted a few years ago, quite a few stainless steel alloys can rust under various environmental conditions. So corrosion by itself is not an indicator of stainless vs chromed steel.
I just went to the Fritz Hansen website and found the below text on maintenance for their stainless steel. No mention of what type of alloy is used (perhaps constantly changing due to the recycled scrap nature of their sourcing), but notice the second to last sentence.
STEEL
The stainless steel used in all Poul Kjærholm furniture is produced by an Italian steel manufacturer, using
stainless steel scraps from all over Europe. As Republic of Fritz Hansen™ only uses a very carefully selected
steel supplier, the quality and hardness are of a uniformly high standard. Cutting and grinding takes place in
Nakskov, Denmark.
MAINTENANCE & CARE
Clean the steel by using a soft cloth soaked in spirits. If greasy or stubborn spots are not removed rub the
spots with a cloth soaked in benzene.
Do not use chlorine based liquids on the steel as this will cause the steel to rust.
Be sure to dry off the steel with a dry cloth after cleaning floors to avoid spots on the steel.
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