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The Holy Shroud negative and positive image
giant blue swallowtail
Plate 8 Penny Black with red Maltese cross and blue Handsworth PYP Box cancellation. It is the world's first adhesive postage stamp.
Scuffed and scratched marbled paper background texture, Red wave with blue splodge
close - up of a cat, isolated on white background
Antique red paper marbling background texture.
Moleskine texture color cover on white background
Red siskin Pattern Design on Venezuelan Bolivar Currency
MALDIVES - CIRCA 1975: A stamp printed in India from the \
In vitro bacterial culture
Bank of england coat of arms on a pound note
Scuffed red and purple marbled vintage paper pattern background
Lebanese postage stamp on black background
Closed up butterfly's wing - negative image technique.
Microscopic photo of a thin section of calcareous tufa of Holocene age.
A textured effect of background is full frame.
Triangular pollen grains of
Swiss 10 Rappen Strubel stamp held by tweezers.
Old British Half penny stamp with postmark, King Edward VII, 1902
Backgrounds of Characteristics  of Bacteria and Fungi  for education in Microbiology laboratory.
I painted acrylic colors on white paper and I folded the paper together similar to the rorschach inkblot method that create the texture of mixed acrylic colors.
Squash preparation of stained onion root tip cells showing various stages of mitosis. Differential interference contrast optics on a Leica microscope, Image taken with the X40 objective lens.  Depth of focus is extremely shallow (just a few microns).  Differential interference contrast results in an optical slice horizontally through the specimen providing maximum possible resolution at this magnification and good contrast. Chromatic abberation is inevitable in light microscopy, but has been kept to a minimum in this image.
A fly mouth part as seen under a compound or light microscope at objective X10.
Entire branch leaf of the spoon-leaved moss, Bryoandersonia illecebra, showing the single costa and alar cells, with polarization at 100x.
Vintage Victorian bookplate, title, Atlas of Ancient Geography 19th Century
Mourning Floater fly wings under the magnifying glass—microscope close picture.
Some amoebas like this one form shells. Shell is composed of bits of rock (sand), diatom shells, and other debris. Fresh water. Live specimen. Wet mount, 40X objective, transmitted brightfield illumination.
Free Images: "bestof:FlosAresteHew1862AC1.jpg 2011-11-15 Specimen of a Catalogue of the Lycaenidae in the British Museum W C Hewitson PD-old-100 Uploaded with UploadWizard Flos"
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