File:Rainbow calsilica 1.jpg
Original file (3,485 × 1,868 pixels, file size: 5.67 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionRainbow calsilica 1.jpg |
English: "Rainbow calsilica" is man-made material attributed to Mexico (?) that consists of irregular, colorful layers. It is intended to imitate "fordite", which is an artificial material composed of numerous layers of car paint.
Stories have been invented to explain the origin of this material (for example, semi-natural sedimentary layers derived from an old tile-making plant). Chemical analysis has shown that there is nothing natural about these colorful layers. The bulk of rainbow calsilica is crushed calcium carbonate rock. Artificial dyes have been added (e.g., the blue is from a post-1930s pigment called PB15 and the greenish and yellowish bands contain a pigment called PY1, or Hansa Yellow). Plastic-like stabilizers have also been added - aliphatic polymers or a paraffin derivative, plus other undetermined chemicals. I like to call artificial stones "rock-us fake-us". They can be attractive, so I don't have a problem with them. I do have a problem with scammers lying about the origin of such materials. Chemical info. from: Kiefert (2003) - "Rainbow calsilica". The Journal of the Gemmological Association of Hong Kong 24: 41-46. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/46927792564/ |
Author | James St. John |
Licensing
[edit]- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/46927792564 (archive). It was reviewed on 30 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
30 January 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:37, 30 January 2020 | 3,485 × 1,868 (5.67 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 09:44, 20 April 2019 |
Lens focal length | 8.295 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 11:57, 20 April 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:44, 20 April 2019 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 07:57, 20 April 2019 |
Unique ID of original document | AC7D8CF7EE6C8302A887DAFF6E8A26A3 |