December 13, 2017

12/13 Phones on front table

Have out Fingerprint Comparison ws: 9-12 and note packet p.13Be ready for quiz on fingerprint matching (need to know different minutiae)

After quiz - work on pp.15-17

HW: packet pp.15-17 due Friday TEST F on Monday 12/18

December 13, 2017

Activity 6-5/6-6

December 13, 2017

Dusting-glass, metal, plastic-dust is applied with a camel hair brush - sticks to sweat and oil-lift with tape and put onto a contrasting card-color varies depending on color of surface-only a little is needed!-don't inhale dust

nonporous

Contrast

December 13, 2017

Silver Nitrate

-wood, styrofoam, paper, drywall-spray print and reacts with salt (in sweat) to form a black print under UV light; print is black/brown silver chloride precipitate-avoid skin contact

December 13, 2017

Iodine Fuming

-paper, cardboard, unpainted surface-sublimation of iodine in a closed container; attracts to oil and sweat-brown/purple print which disappears unless sprayed with starch-don't inhale or ingest

both porous &nonporous

December 13, 2017

Choose 5 out of 7 (STAR the ones that you want me to grade)

- Be sure to label the type of print - You must choose at least two sets that are identical

- If identical, label at least 6 minutiae with numbers to show they match - If non-identical, give at least 2 reasons why they are not the same