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Burr (edge) Metal burr extending beyond the edge of the cut piece, view on the cut face (top) and from the bottom (bottom) A burr is a raised edge or small piece of material that remains attached to a workpiece after a modification process. [1] It is usually an unwanted piece of material and is removed with a deburring tool in a process called ...
Burning: a darkroom technique. To burn-in a print, the print is first given normal exposure. Next, extra exposure is given to the area or areas that need to be darkened. A card or other opaque object is held between the enlarger lens and the photographic paper in such a way as to allow light to fall only on the portion of the scene to be darkened.
Foxing. Foxing is an age-related process of deterioration that causes spots and browning on old paper documents such as books, postage stamps, old paper money and certificates. The name may derive from the fox -like reddish-brown color of the stains, [1] caused by the rust chemical ferric oxide which may be involved.
Burning of joss paper. Metal contents analysis of ash samples shows that joss paper burning emits a lot of toxic components causing health risks. There is a significant amount of heavy metals in the dust fume and bottom ash, e.g., aluminium, iron, manganese, copper, lead, zinc and cadmium.
Today, machine-made paper may artificially have its edges produced with deckle edges. [2]: 456, 458 The deckle could not make a perfect seal against the screen at the edges and the paper slurry would seep under, creating a rough edge to the paper. The deckle edge could be trimmed off, but this extra step added to the cost of the book.
Papyrus (/ pəˈpaɪrəs / pə-PY-rəs) is a material similar to thick paper that was used in ancient times as a writing surface. It was made from the pith of the papyrus plant, Cyperus papyrus, a wetland sedge. [1] Papyrus (plural: papyri or papyruses[2]) can also refer to a document written on sheets of such material, joined side by side and ...
A deckle is a removable wooden frame or "fence" used in manual papermaking. The deckle is placed into a mould to keep the paper pulp slurry within the bounds of the wire facing on a mould, and to control the size of the sheet produced. The mould and deckle is dipped into a vat of water and paper pulp that has been beaten (fibrillated).
Rolling paper is a specialty paper used for making cigarettes (commercially manufactured filter cigarettes and individually made roll-your-own cigarettes). Rolling papers are packs of several cigarette-size sheets, often folded inside a cardboard wrapper. They are also known as 'blanks', which are used to encase tobacco or cannabis. [1]
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