Color evolution of a pyrrole-based enone dye in radical photopolymerization formulations

The (V-K) colors of giant elliptical galaxies as a function of redshift are discussed. Present data are consistent with mild color evolution at z ~ 0.45. An infrared Hubble (redshift-magnitude) diagram is given. Cosmological models with qo = 0 and no luminosity evolution are clearly excluded by the present data. A wide variety of models including those with qo = 0 are permissible if luminosity evolution is included. Instrumental and programmatic implications of these results are summarized.

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The Use of Digitized Video Images for Monitoring Color and Color Evolution of Jonagold Apples During Shelf Life

Developments in Food Engineering ◽

10.1007/978-1-4615-2674-2_59 ◽

1994 ◽

pp. 200-202

Author(s):

Frans Vervaeke ◽

Eddie Schrevens ◽

Jan Verreydt ◽

Ken Portier ◽

Josse De Baerdemaeker

Keyword(s):

Shelf Life ◽

Color Evolution ◽

Video Images

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RGB color evolution: a digital tool for monitoring the visual changes of iron oxide pigments irradiated by infrared laser pulses

Rem Revista Escola de Minas ◽

10.1590/s0370-44672011000200009 ◽

2011 ◽

Vol 64 (2) ◽

pp. 187-191

Author(s):

Adilson Rodrigues da Costa ◽

Flávio Sandro Lays Cassino ◽

Rémy Chapoulie ◽

Florence Rud

Keyword(s):

Near Infrared ◽

Amorphous Material ◽

Laser Pulses ◽

Color Measurement ◽

Digital Tool ◽

Color Changes ◽

Color Evolution ◽

Powder Particles ◽

Iron Oxide Pigments ◽

Fast Chemical

Laser irradiation of powdered iron oxides (goethite and hematite) was performed in order to obtain information about their interaction with short duration near-infrared pulses. Results have shown that under some conditions, Nd:YAG laser provides enough energy to induce fast chemical and structural transformations of the goethite and hematite. This kind of information is of great interest for professionals working with artwork conservation because this technique is used in the conservation of cultural heritage. Depending on the laser's working conditions, glassy (amorphous) material was detected and its presence was related to areas of fast solidification where the energy delivered was enough to melt the powder particles. Color changes were observed and quantified by means of an RGB color measurement method developed to show the evolution of each color component.

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