Page 7 - An Inky Lead Questioned Documents

Teaching

Timeline

GROUNDWORK
Before conducting this laboratory exercise, the details of The Investigation should be shared with the class to
provide the context of the crime. Covering this material once should be sufficient for all laboratory modules.

DAY 1 DAY 3

Introduce the background material on forensic Prepare the lab for thin layer chromatography
document examination, saving in-depth by setting out the development chambers
discussion of chromatography for Day Three. (glass jars), TLC plates, the actual receipts,
and solvent.
Make certain students understand the type of
characters effective for handwriting identification. Prepare the board for students to record the
information obtained from their analysis of the
Distribute Lab Procedures and Assign Pre Lab ink on the receipts.
Questions as homework.
Instruct students to follow the lab procedure
for thin layer chromatography of Ink. During
this lab, two TLC plates will be ran sequentially.
DAY 2 While students are watching the first TLC plate

run, discuss how chromatography works and
Distribute the receipt photocopies included in what is happening in the laboratory exercise.
the kit and instruct students to follow the lab
procedure for handwriting analysis.

Encourage students to answer the post-lab While the second TLC plate is running, encourage
questions pertaining to handwriting analysis students to begin copying the first run data from
while the information is still fresh in their minds. the board. Students may also begin answering the

post-lab questions.

THE MYSTERY OF LYLE AND LOUISE 7