Sunday, June 23, 2013

Friday, June 21, 2013


The Johannisfriedhof is a large medieval cemetery in Nuremberg with graves of some famous persons like Albrecht Dürer or Veit Stoß.

From above: 
Johannisfriedhof Nürnberg

In Black & White:
 Johannisfriedhof Nürnberg

 And seen with a infrared camera:

Johannisfriedhof Infrared photography

Johannisfriedhof infrared light

Linked with The Weekend in Black and White.

Friday, June 14, 2013


Puddles on a forest way in the Thuringian Forest. Not really jungle lakes, but in a close view they have some interesting perspectives.

Linked with Weekendreflection and Scenicweekends.

Thursday, June 13, 2013

Luminol and Iron Minerals

Luminol is a chemical with the formula C8H7N3O2 and the official name 5-Amino-2,3-dihydro-1,4-phthalazinedione. It is used in forensic analyses to find blood traces on crime scenes and in biology to find iron, copper or cyanide in cells. Luminol is reacting with oxidizing chemicals like hydrogen peroxide (H2O2) and produces a blue glowing chemoluminescence. Under normal conditions this luminescence in invisible but the use of catalyst chemicals like iron or copper cause an intensive cold blue light. 

The catalytic effect could also be used to display iron minerals and their distribution. In the photos below show an ammonite from the Lower Jurassic of Southern Germany. The fossil is made of pyrite (FeS2) with low contents of marcasite (also FeS2, but with another crystal class). On the surface the minerals are partly transformed to iron oxide. With luminol the minerals show a clear blue chemoluminescens that is most intensive on the parts that are oxidized.

Ammonite (photo size 3 cm)
Ammonite with luminol.

Another iron containing mineral is glauconite an iron rich clay mineral. It seems also to react in the presence of luminol. The photos below show an ammonite from the Upper Jurassic that is covered by a thin film of glauconite minerals. The more intensive luminescence is on areas where remains of sediment cover the fossil. This sediment can contain pyrite or iron oxides that are reacting.

Ammonite covered by glauconite (photo size 6 cm).

The ammonite with luminol.

Further experiments with lumino: luminol and the cauliflower structure and luminol experiments.

Sunday, June 9, 2013

Copper Nitrate

Copper(II) nitrate ( Cu(NO3)2) under the microscope and in polarized light.

copper nitrate microscope
Copper nitrate (Magnification 100x)

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