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Why is the porosity test done?
just
When do you use a porosity test in hairdressing?
a porosity test is done while doing consultation with the client to show how much moisture the hair can absorb.
Why do you carry out a hair porosity test?
Porosity tests are carried out to assess the condition of the cuticle layer of the hair.
What dates were pennies made from copper?
1793-1857 : pure copper1857-1864 : 88% copper, 12% nickel1864-1942 and 1944-mid 1982 : 95% copper, 5% tin/zinc1943 : steel plated with zincmid 1982-present : zinc plated with copper There have never been "lead" or "silver" cents. Test pieces were made in aluminum in 1974 but were not released to the public.
Are there any steel dimes minted in 1975?
All dimes dated 1965 and later are copper-nickel clad. Your coin may have been plated. You can test it with a magnet - a plated dime won't stick or will only be attracted very weakly.
When conducting a penetrant test what does the spherical indications on the surface of a part mean?
Porosity
What is a 1935 penny worth?
Steel cents were only made in 1943 when copper was needed for the war effort. Your coin has been plated. You can test it with a magnet - a plated cent won't stick or will only be attracted very weakly, while a real steel cent will stick firmly.
How much 1943 copper worth?
The value of a copper 1943 penny is $200,000+. However, copper-plated counterfeits are prevalent. In order to test for a counterfeit, run a magnet over the penny. If it doesn't stick, you are now the proud owner one of the rarest mis-struck coins in U.S. Mint history.
What is a 1935 steel penny worth?
Steel cents were only made in 1943 when copper was needed for the war effort. Your coin has been plated. You can test it with a magnet - a plated cent won't stick or will only be attracted very weakly, while a real steel cent will stick firmly.
How can you test your silver?
Well, the best way to test your silver is with silver acid, if in the acid test come very color red it is silver. But you can test with 18k acid for testing gold metal, if in the stone the line change blue color it is silver. But if you put silver acid in other white metal can be white gold and you see the line in the stone change yellow their have yellow gold inside or if it is red it is copper ! Wake up ! can be mix copper, yellow gold with Rhodium Plated. that in today's market their call commun artificial white gold plated! Sincerely: Profectional jewelry's!
What materials do you need to test the streak?
Plated Plate
How can you tell if your 1943 penny is copper or steel with zinc plating?
If the coin has not been re-plated, the difference should be obvious to look at. The zinc-coated coins will be grayish in color rather than coppery. However, a lot of people create fake 1943 copper coins by re-plating a steel cent with copper. If you remember back to elementary school science class, copper is not attracted to a magnet, but steel is. Use a small magnet to test your coin. AFAIK all genuine copper 1943 cents are accounted for and in collections somewhere, so if yours appears to be copper I'm willing to guess it will turn out to be plated, unfortunately.
