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Is rust patina?

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Yes.On metal, patina is a coating of various chemical compounds such as oxides, carbonates, sulfides, or sulfates formed on the surface during exposure to atmospheric elements (oxygen, rain, acid rain, carbon dioxide, sulfur-bearing compounds), a common example of which is rust which forms on iron or steel when exposed to oxygen.
 
For me, if it is pitted or damaged, that's NOT patina, that's material failure, it can be appealing and interesting, and maybe even collectable, but not patina. I think patina is a slow, even surface change that occurs over time and cannot really be reproduced. That being said, there are some beautiful man made "patinas" out there! Copper patinas, iron rusts. just my two cents.
 
If you are the seller it is patina. If you are the buyer it is rust. Price varies on what you can both agree on.
 
Thoughts .....

Rust is the oxidation of ferrous-metal.

Aging is the oxidation of most-everything else --
with exception to diamonds and 24K gold.

Could be there are many things that do not show that they are
being exposed to oxidants over time.


Oxygen in the presence of atmospheric-moisture coming
into contact with ferrous-metals is a good recipe for rust.

When the rust is left to continue to oxidize ... there will
be an accumulation of iron oxide.

If a person can run a hand or rag over this surface,
some of the iron oxide may transfer to the hand / rag.

More than a few of us refer to this as ''rust''.

However, if a person were to lightly burnish (gently clean) the areas
available to the hand / rag ... say with 0000-steel wool plus
a neutral, non-oily fluid ... water, perhaps ... the now-smooth
and ''dustless'' metallic-surface is thought to be ''in patina''.

Some consider it a wise move to seal the surfaces after burnishing
and wipe-down. I agree. My preference is for a matte sealant.

Hopefully the surface has not been polished to the point where
the surface is ''shiny'' and highly reflective.

And what remains are beautiful hints of blue, deep-gray, plum-brown,
and maybe just a hint of golden, yellow-orange.


Below are some fotos of Dave Stromberger's 1919 Flying Merkel bicycle.
The first-two fotos show surfaces ''as acquired'' ... suffering from 96-years
of oxidation.

The final-two fotos are shown ''after'' burnishing and sealing.



..... patric




fm 6ds.jpg


fm 7ds.jpg
fm 8ds.jpg


1919-Flying-Merkel-1-1024x791  fm 7.jpg
 
In this coyote's humble opinion, patina is a combination of various elements. A light surface rust in some areas of the painted surfaces or dull spots or a chip in the chrome are gentle signs of a well used but maintained machine. However, the moment that chrome flakes off in various spots or the paint is destroyed or holes and pits set in is when rust becomes a problem.

Other signs of patina include weathered grips, weathered upholstery, some dull spokes, some scratches in the paint, tarnish on metallic paint, or weathered pedal blocks.
 
yes, it is...(From Wikipedia)

Patina (/ˈpætɨnə/ or /pəˈtiːnə/) is a thin layer that variously forms on the surface of stone; on copper, bronze and similar metals (tarnish produced by oxidation or other chemical processes);[1] on wooden furniture (sheen produced by age, wear, and polishing); or any such acquired change of a surface through age and exposure. Patinas can provide a protective covering to materials that would otherwise be damaged by corrosion or weathering. They may also be aesthetically appealing.

On metal, patina is a coating of various chemical compounds such as oxides, carbonates, sulfides, or sulfates formed on the surface during exposure to atmospheric elements (oxygen, rain, acid rain, carbon dioxide, sulfur-bearing compounds), a common example of which is rust which forms on iron or steel when exposed to oxygen. Patina also refers to accumulated changes in surface texture and colour that result from normal use of an object such as a coin or a piece of furniture over time.[2]

Archaeologists also use the term "patina" to refer to a corticated layer that develops over time that is due to a range of complex factors on flint tools and ancient stone monuments.[1] This has led stone tool analysts in recent times to generally prefer the term "cortification" as a better term to describe the process than "patination".[3]

In geology and geomorphology, the term "patina" is used to refer to discolored film or thin outer layer produced either on or within the surface of a rock or other material by either the development of a weathering rind within the surface of a rock, the formation of desert varnish on the surface of a rock, or combination of both. It also refers to development as the result of weathering of a case-hardened layer, called "cortex" by geologists, within the surface of either a flint or chert nodule.[4][5]
 
Yes.On metal, patina is a coating of various chemical compounds such as oxides, carbonates, sulfides, or sulfates formed on the surface during exposure to atmospheric elements (oxygen, rain, acid rain, carbon dioxide, sulfur-bearing compounds), a common example of which is rust which forms on iron or steel when exposed to oxygen.

Did you realize that Wikipedia had the same exact definition, word for word?!?!?!

The only thing that I might add to your well conceived analysis and presentation is that: Patina also refers to accumulated changes in surface texture and colour that result from normal use of an object such as a coin or a piece of furniture over time.

Yes, that would be colour with a "u"
 
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