1. Aim: How are Documents Analyzed? Do Now: Get a Textbook and Take to Your Seats

2.  Handwriting and signatures  Inks  Copy Machines  Papers  Restoring erased or obliterated writing

3.  To remove writing by physical or chemical means  Erase, scrape, chlorine, etc…  Digital Imaging is useful tool used by document examiners to Find Obliterations

4.  Impressions left on paper beneath the primary writing ◦ Pencil rubbings  Electrostatic Detection Apparatus (ESDA) is used to observe indentations ◦ Paper holds “charge” because of static created during rubbing process of criminal ◦ Pour toner over a charges sheet of plastic to see image of impression

5.  The following characteristics are used to identify paper 1. Color 2. Density 3. Dyes or Bleaches 4. Fluorescence under UV light 5. Thickness 6. Watermarks

6.  A design incorporated into the paper during manufacturing process by reducing the number of fibers within a certain patterned area

7.  Investigators compare inks composition (chemical makeup)  Can even determine how long ink has been on page  A good and inexpensive way to analyze water-based ink is Paper Chromatography

9. 1. On a separate sheet of paper Sign your name 4 times 2. Place graph paper over signature and mark the top points of each letter  Example the letter M has 3 top points 3. Use a ruler to connect the points 4. Repeat for other 3 signatures 5. Now use graph paper to mark the bottom points of each letter 6. Connect points with ruler 7. Note 2 similarities and 2 differences from top analysis 8. Note 2 similarities and 2 differences from bottom analysis

10.  Using the 4 signature from Activity 16.5 follow the procedure for Activity 16.4 pg. 488  I have 6 letter slant transparency templates to share  Answer all questions #1-7 on pg. 488 and hand in