The caption under the picture doesn't make it clear how long the casting has been out of the oven "Steel castings after undergoing 12 hour 1,200 °C (2,190 °F) heat treatment."
I recently took up pottery so I know that when the temperature is >1200 the clay become less orange and more white. Harry On Sun, Oct 19, 2014 at 12:37 AM, David Roberson <dlrober...@aol.com> wrote: > How do we reconcile that the color observed by people and I assume normal > cameras is orange for the casting at 1200 C in the second sample I found? > We are discussing the color shown in the pictures instead of the peak > emission wavelength are we not? > > Why would you expect the device to look white hot when a known metal > casting looks orange hot at approximately the same temperature? What am I > missing? > > Dave > > > > -----Original Message----- > From: H Veeder <hveeder...@gmail.com> > To: vortex-l <vortex-l@eskimo.com> > Sent: Sun, Oct 19, 2014 12:31 am > Subject: Re: [Vo]:Color Temperature > > _Colour temperature_ refers to the *peak* emission of a blackbody whose > temperature produces a peak emission within the visible spectrum. > > e.g. The surface of the sun is about 6000C and the peek emission is > white light so it has colour temperature of white. > > > _Incadescence_ is the *visible* light emitted by a black body at a given > temperature. > > An iron at 800C glows red but the peak emission is in the infrared . > > harry > > On Sat, Oct 18, 2014 at 11:36 PM, Patrick Ellul <ellulpatr...@gmail.com> > wrote: > >> Hi Dave, >> Jed refers to: http://en.wikipedia.org/wiki/Incandescence >> Regards. >> >> On Sun, Oct 19, 2014 at 1:38 PM, David Roberson <dlrober...@aol.com> >> wrote: >> >>> Take a look at the article in wikipedia about color temperature. Unless >>> I am reading it incorrectly the color expected for a source at 1700K is >>> quite orange. This is in line with what is reported in the latest test. >>> >>> Could someone take a moment to explain to me why the device should not >>> be orange? I have seen where Jed thinks it should be white and I am at a >>> loss. >>> >>> The article is located at: >>> http://en.wikipedia.org/wiki/Color_temperature. >>> >>> Dave >>> >> >> >> >> -- >> Patrick >> >> www.tRacePerfect.com >> The daily puzzle everyone can finish but not everyone can perfect! >> The quickest puzzle ever! >> > >
