Page 22 - An Inky Lead Questioned Documents

Ink Chromatography

Procedure

Chromatography of Ink

1. Dispense 5 droppers-full of solvent into the 4. Beginning approximately 0.5 cm from the
development chamber. Secure the lid on the jar. edge of the TLC plate, equally space 5 dots
in pencil on the pencil line. Below the line,
2. Lightly shake up or rotate the development gently label the dots with the letters
chamber to saturate the air inside.
A through E.

3. In pencil, gently draw a horizontal line
on the front (white side) of the TLC plate, 5. On the Data Collection sheet, record the receipt
approximately 1 cm from the bottom. Be careful number and value and the name of the person
not to scratch the surface. who signed the receipt.

22 THE MYSTERY OF LYLE AND LOUISE