Question

name: name redacted
handwriting unit study guide
turn in on test day for extra credit

1. terms:

vocab word	look up the definition from google or from class notes/activities	explain in your own words (7 words or less)
\graphology\ vs. \forensic document analysis\
forensic science
chromatography
rf value

1. describe what happened in the lindbergh baby case
2. describe what happened in the anthrax letter case
3. if a pigment from an ink pen travels 25mm and the solvent travels 40mm, what is the rf value? (show your work)
4. if a pigment from an ink pen travels 13mm and the solvent travels 39mm, what is the rf value? (show your work)
5. are the pigments from questions 4 and 5 likely to be a match? why or why not?
6. how are the following people connected to the cases we covered in class?

a. charles lindbergh jr.
b. charles lindbergh sr.
c. tom daschle

Explanation:

Step1: Recall Rf - value formula

The formula for the Rf (retention - factor) value is $Rf=\frac{\text{distance traveled by pigment}}{\text{distance traveled by solvent}}$.

Step2: Calculate Rf value for question 4

Given that the distance traveled by the pigment is $25$mm and the distance traveled by the solvent is $40$mm. Using the formula, $Rf_1=\frac{25}{40}= 0.625$.

Step3: Calculate Rf value for question 5

Given that the distance traveled by the pigment is $13$mm and the distance traveled by the solvent is $39$mm. Using the formula, $Rf_2=\frac{13}{39}=\frac{1}{3}\approx0.333$.

Step4: Compare Rf values for question 6

Since $Rf_1 = 0.625$ and $Rf_2=0.333$, and Rf values are unique for a particular pigment - solvent combination under the same conditions, the pigments are not likely a match because their Rf values are different.

Answer:

1. $Rf = 0.625$
2. $Rf=\frac{1}{3}\approx0.333$
3. No, different Rf values.