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tack - To attach in a few spots, as in dry-mounting to position the piece before placing it is the press.

tacking iron - Small iron with adjustable thermostat used to "spot tack", position, and hold a print in place during dry mounting process.

TAPPI - Technical Association of the Pulp and Paper Industry. The objectives of TAPPI are to further scientific advancement in the pulp and paper industry; promote investigation, research and interchange of ideas among its members; encourage education in the science and practice of pulp and papermaking; collect and disseminate information; and provide technical facts, data, and standards specific to the manufacture of pulp and paper and its end uses.

tested fade - Standard testing and rating, evaluating a color dye or pigment within a board (as in museum board in colors) to retain its overall brightness, hue, and saturation without fading or changing.

text paper - A general term applied to various grades of printing papers which are made for the specific use of bookwork. Often the papers are watermarked with the word "text".

text weight - Relative classification of thickness of paper. Text weight is usually attributed to the thickness typical in published hardbound books. Literally, paper designed to hold text on the printed page. The stock is firm, but not rigid like cover weight.

thermal material - In reference to temperature indicator strips, being or involving a state of matter dependent upon temperatures.

thymol - A crystalline phenol of aromatic odor and antiseptic properties used chiefly as a fungicide and preservative.

tin type - Popular photographic process around the 1860s using a block enamelled template instead of glass. The process is a direct collodion positive one, yielding an image directly on the plate.

tipping in - To lightly attach with paste a leaf onto a sheet or printed book. colored prints are often "tipped in" expensive art books.

tissue paper - Category of papers characterized by extreme lightness and transparency. These papers suitable for napkins and bathroom tissues, can be made on any type of paper machine. Basic size: 24 x 36. Basic weights are less than 18 lbs. A ream of tissue contains 480 sheets.

toned image - Usually a black and white print submerged in a toner bath. The toner may affect image color, print tone, or both. Some toners render the print more stable and are used for preservation, as the toning solutions coat the silver components of the print or film.

toner - (1) The material employed to develop a latent xerographic image. (2) In photography, a compound used to impart a color to a developed black-and-white silver image.

toning - Treating a black and white print with a chemical to change the color and to protect the stability of the silver. Toners commonly used for photographic conservation include gold, selenium, and brown.

tooth - Characteristic of paper. A slightly rough paper which permits acceptance of ink readily.

translucency - Ability to transmit light without being transparent.

transparency - A positive film image with the same arrangement of values as the original scene. A 35mm slide is a transparency, but the term is more usually applied to images made in larger formats such as 2-1/4 square or 4 x 5. Most often refers to a color image.

Triacetate - See acetate.

Tyvek - Synthetic material composed of dense polyethylene threads woven and then compressed to form a paper like sheet. Well-known for its characteristics of strength and archival storage capabilities.