Chapter 35. Lab IX-1 Presumptive Color Tests for Gunshot Residue

Equipment and Materials

You’ll need the following items to complete this lab session. (The standard kit for this book, available from, includes the items listed in the first group.)

Materials from Kit

  • Goggles

  • Bottle, sprayer

  • Lead nitrate, 0.1% w/v

  • Modified Griess reagent, part A

  • Modified Griess reagent, part B

  • Sodium nitrite, 1% w/v

Materials you Provide

  • Gloves

  • Acetone

  • Camera (optional)

  • Clothes iron

  • Cotton swabs

  • Firearm and ammunition (optional; see text)

  • Measuring tape or yard/meter stick

  • Paper (see Figure 35-2)

  • Paper towels

  • Pencil

  • Permanent marker or grease pencil

  • Plastic wrap

  • Scanner and software (optional)

  • Scissors

  • Sodium rhodizonate and buffer (optional)

  • Tape, masking ...

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