Fibre recovery in the lab

Question 1

what must all garments worn be during recovery of fibre?

Answer 1

non-shedding

Question 2

step by step guide of pre-examination checks

Answer 2

• item checked to make sure it is what it says
• item placed on protected and cleaned lab bench
• examiner will begin their case notes and produced annotated sketch
• item divided into examination zones

Question 3

what lightening is use?

Answer 3

directional lighting

Question 4

give 6 methods of fibre retrieval

Answer 4

picking
taping
shaking
vacuuming
scraping
combing

Question 5

what is picking?

Answer 5

individual fibres, tufts and clumps are picked off using forceps

Question 6

positive of picking

Answer 6

allows exact location to be recorded

Question 7

what is picking a method of choice for

Answer 7

shoes
weapons
complex shapes
pockets

Question 8

what is picking used in conjunction with

Answer 8

stereomicroscope

Question 9

what is taping

Answer 9

adhesive tape applied to item

considered most efficient

Question 10

where is taping not usually used

Answer 10

when glass is present

Question 11

what is Rollering (taping)

Answer 11

J-Lar tape is reverse wound around a roller

Question 12

what is sheet support (taping)

Answer 12

tape is reverse wound around roller

Question 13

what is shaking

Answer 13

item shaken over clean paper

distribution info lost

Question 14

what is vacuuming

Answer 14

specialist vacuum applied to the item and individual fibres are retrieved from a filter area

can be used in zones

Question 15

what is scraping

Answer 15

scraping device passed over the item in an attempt to knock fibres from the item

distribution info lost

could be used in zones

Question 16

what is combing

Answer 16

a comb which a thin layer of clean material is fitted

Question 17

how do you test sheddability

Answer 17

a short piece of tape is firmly applied to the item and is stuck to the examination form

Question 18

references - constituent fibre control

Answer 18

one of more tapes prepared and mounted on an acetate sheet and labelled as a reference sample

sample should be representative of all fibres within the item

Question 19

how do you present fibres

Answer 19

taped and before exhaustion, the tape is stuck to an acetate sheet and the edges are sealed with further clean tape to avoid contamination

acetates can be stored for decades in this state or can be assessed immediately