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Newsletter 01-2016

Kremer Pigmente

Malachite - perhaps the oldest known

bright green pigment

 

Malachite is perhaps the oldest known bright green pigment. It is the natural basic copper carbonate and is similar in composition to the blue basic copper carbonate, azurite, except that it contains a greater amount of combined water. Like azurite it occurs in many parts of the world and is associated with secondary copper ore deposits.

Malachite was used in ancient Egypt for eye-paint as early as predynastic times and was found on Fourth Dynasty tomb paintings. Curiously, malachite was not used in paintings extensively as azurite in Europe. It is also less frequently mentioned in written sources. Malachite was found to be used extensively along with azurite in Western Chinese paintings of the ninth to the tenth centuries. It was also reported on seventh- to eight-century Buddhist wall paintings in Japan.

Classical and medieval writings refer to malachite as "chrysocolla", a word derived from the Greek words for gold and glue because the ancients used it in soldering gold. The current term chrysocolla was given by mineralogists to the blue-green natural cryptocrystalline hydro silicate of copper (see chrysocolla). Malachite is prepared as a pigment by careful selection, grinding and sieving. In transmitted light coarse particles are dark green and fine particles are a pale green. If the particles are too finely ground it becomes too pale for practical use. Because malachite is produced by crushing and grinding, all the particles have a fractured appearance. Many larger particles have a fibrous structure and it is not uncommon to find particles of associated minerals such as azurite, chrysocolla and cuprite. Under the microscope malachite particles show a pale greenish color by transmitted light.

Malachite is stable to light and normal atmosphere. Malachite has a moderately low refractive index, and is thus more satisfactory in tempera and in an oil-medium.

Malachite is also suitable for the technique of true fresco. It is the most important green up until the 18th century. Its properties are similar to azurite: it turns yellowish green in oil, is permanent in frescos when mixed up fresh with lime, and is suitable for tempera.

Our raw malachite is from eastern Congo in Africa.

This is a very crude ore. We first separate by hand, then we separate by shaking table method, and finally by levitation.

The MP-process is orientated on old recipes of European and Chinese treatments of mineral pigments. This process inactivates the reactivity of the minerals – to a certain extent – and “cleans” the surface.

On every crystal there are points of lower perfection. These points have a higher reactivity. The MP-process covers and reduces the reactivity at these areas. Little particles are attached to bigger particles, making the separation of different size particles difficult. The MP-process facilitates this separation.

 

Portuguese Fir Turpentine

The Portuguese Fir Turpentine from the Iberian Peninsula is again available. In particular the pleasant smell must be pointed out.

Chemical composition: (2-Pinen)C10H16

The raw material for Fir Turpentine is a balsam from various types of pinetrees (30-50 varieties).

The Portuguese Fir Turpentine (# 70000) can be obtained in 1-liter and 3-liter containers.

 - Sorry, not available at Kremer Pigments Inc -

Kremer Pigmente on international Fairs

Kremer Pigmente take part on many international meetings and trade fairs for art, culture and conservation.
We look forward meeting you!

Monumento Salzburg

January 28 - 30, 2016, Salzburg, Austria

The Monumento Salzburg has evolved to an international platform for monument preservation, restoration and conservation. It is an important meeting point for experts and everyone else who is interested.

We look forward meeting you at our booth 206 in hall 10!

 

Creativeworld

January 30 - February 02, 2016, Frankfurt, Germany

International trade fair for hobbies, arts & crafts and artists requisites. The world’s biggest trade fair for the creative sector opens its doors in Frankfurt am Main. "Create something exciting...beautiful...extraordinary...new..colourful" is this year's motto.

We look forward meeting you at our booth F46, hall 4.2!

 

CAA Annual Conference in Washington, DC

February 03 - 06, 2016, Washington, DC

In 2016, CAA will return to Washington, DC for the first time in twenty-five years for its 104th Annual Conference. The four-day event will be held at the Washington Marriott Wardman Park Hotel from Wednesday, February 3 through Saturday, February 6.

 

ART Karlsruhe

February 18 - 21, 2016, Karlsruhe, Germany

Be it painting or sculpture, drawing, graphic prints, multiples or photography: Covering an area of roughly 35,000 m2, a clearly structured, graceful architectural landscape of art is being created to encourage intensive examination, concentrated discussion and relaxing shopping.

We look forward meeting you at our booth V23, hall 1!



ATTENTION: New Shipping regulations!

The following articles can only be shipped in max. 1-liter-containers with normal shipping methods. Further 1-liter-containers can also be shipped.

The shipment of 3-liter-containers (and bigger) is only possible by a forwarder!

Affected product numbers: 70700, 70800, 7957067404, 70300, 70740, 70820, 70780, 70450, 70500, 79550, 79500, 12200, 70400, 70392, 70394, 62802

 

Special Offer: Cadmium Pigments

99407 Cadmium Yellow light, similar Cadmium Yellow No. 4

99412 Cadmium Yellow dark

99413 Cadmium Orange medium

99414 Cadmium Orange dark

99409 Cadmium Red

99408 Cadmium Red dark, similar RAL 3003

- Sorry, not available at Kremer Pigments Inc -