Chapters 11 and 12, and Part II Flashcards
It is an original or official written or printed-paper furnishing information or used as a proof of something else. It is any object that contains handwritten or typewritten markings whose source or authenticity is in doubt.
Document
Practically all papers maybe classified from the standpoint of their basic _______________ into sets of fiber mixtures.
fiber composition
It is a group wood sulfite mixture. This is pulp from coniferous and dicotyledonous wood in combination with sulfite chemical pulp from conifers.
Mechanical Pulp
It is a chemical pulp from dicotyledonous woods.
Soda-Sulfite Mixture
It is a cotton rag or linen rag.
Rag Sulfite
It is added to paper to improve its texture.
Sizing Material
It is added to paper to give weight. It partially fills the pores between the fibers of the paper.
Loading Material
It deals with the appearance of the document.
Preliminary Examination
If present, it is one of the most important features in the comparison of paper. It is distinctive mark or design placed in the paper at the time of its manufacture, by a roll usually covered with wire cloth known as dandy roll which serves as a means whereby the paper can be identified as the product of a particular manufacturer.
Watermark
These are marks produced on paper by the flexible wire soldered to the surface of the dandly roll that carries the watermark.
Wiremark
It is a test applied on paper without perceptible changing or altering the original appearance of the document.
Physical Test Causing No Perceptible Change
It is the quality of paper that does not allow light to pass through or which prevent dark objects from being seen through the paper.
Opacity
This is done only if sufficient samples are available and if prior authorization from the court is required this can be done.
Physical Examination Causing a Perceptible Change
It is the apparent pressure necessary to burst a hole in a sheet when properly inserted in a suitable instrument.
Bursting strength or “Pop” test
It is obtained on an instrument that registers the number of alternate folds the paper will stand before breaking.
Folding endurance test
It is maybe made to determine either the rate of absorption or the total absorption of the paper.
Absorption test
This test determines the fiber composition, the loading material and sizing material used in the paper.
Chemical Test
It is extracted by boiling the paper in water. The solution is tested with dilute tannic acid solution. Positive result is yellow precipitated.
Gelatine
This is extracted by heating the paper on a water bath with 95% alcohol. The solution obtained is evaporated to dryness and the residue dissolved in acetic anhydride, cooled, transferred to a porcelain dish and strong sulfuric acid is added. Positive result s reddish-violet color that quickly changes to red brown.
Rosin
It can be detected by addition of Millon’s reagent on the paper. Pink color appears if casein is present.
Casein
This refers to the removal of writing from the paper. It can be made mechanically or chemically.
Erasures
This refers to the obscuring of writing by superimposing ink, pencil or other marking materials.
Obliteration
This refers to substances used for invisible writing.
Sympathetic Ink
This refers to the partially visible depression appearing on a sheet of paper underneath the one that the visible writing appears.
Indented Writing
This refers to the use of sheets of carbon paper that can be made readable.
Writing on Carbon Paper
This refers to blank paper may contain traces of ink because of previous contact with some writings.
Contact Writing
During the mid-1980s, __________ was first recognized as having application to forensic science by the British molecule biologist ____________
DNA analysis; Alec Jeffreys
It is functionally the hereditary material that contains the genetic information necessary for the duplication of cells and for the production of proteins.
DNA
It is done by first carefully extracting the DNA from the evidentiary samples.
DNA Typing