Magnetic Powder
Summary
TLDRIn this episode of Forensic Education, host Mike McCutcheon explores the use of magnetic powder for evidence processing on textured surfaces. He explains its advantages over traditional fingerprint powder, particularly for new investigators. The video demonstrates the application of fine magnetic powder with a magnetic brush on various textured items like vinyl siding, an orange, and a wooden surface. It also covers the use of different lifting techniques, such as gel tape and Accu trans, to preserve ridge detail on textured surfaces. The summary concludes with the suggestion to practice these techniques for successful fingerprint recovery.
Takeaways
- 🕵️♂️ The video is a forensic education series hosted by Mike McCutcheon, focusing on evidence processing techniques using magnetic powder on textured surfaces.
- 🧲 Mike McCutcheon prefers magnetic powder over traditional fingerprint powder due to its effectiveness on textured surfaces and ease of use for new investigators.
- 🔍 The script compares two types of powders, emphasizing the importance of using the finest powder possible for better fingerprint development.
- 🖌️ Magnetic powder is applied using a magnetic brush with a magnet in the tip, which attracts the powder for application on evidence.
- 🎨 The video uses Lin PV powder, which is available in different colors, including fluorescent, to accommodate various evidence types and surfaces.
- 🍊 The video demonstrates the process of developing fingerprints on textured items like vinyl siding, an orange, wood, and a dark mug, highlighting the importance of selecting the right color powder for visibility.
- 🧤 It is shown that magnetic powder can also be used on plastic and rubber, with a demonstration on the inside of a glove to reveal ridge detail.
- 🔄 The video explains the limitations of using flat tape for lifting prints from textured surfaces and the need for alternative techniques to preserve ridge detail.
- 🔖 The script introduces the use of Diff-Lift tape and Accu-Trans for lifting prints from textured surfaces, emphasizing the improved detail retention compared to standard tape.
- 🔄 Accu-Trans, typically used for latent marks on doors or windows, is also effective for fingerprints on textured surfaces and requires a drying time of two to four minutes.
- 📦 The video concludes with the successful processing of various items and the importance of practice in using magnetic powders and lifting techniques for success in forensics.
Q & A
What is the main topic of the video?
-The main topic of the video is the use of magnetic powder for evidence processing, particularly on textured surfaces.
Why does Mike McCutcheon prefer magnetic powder over traditional fingerprint powder?
-Mike McCutcheon prefers magnetic powder because it works better on textured surfaces and is easier for new investigators and students to master quickly.
What is the significance of the powder's texture in fingerprinting?
-The finer the powder, the better the fingerprint will be, as it is the powder that actually touches the print, ensuring a clearer and more detailed impression.
How is magnetic powder applied in the process?
-Magnetic powder is applied with a magnetic brush that has a magnet in the tip, attracting the powder onto the brush, which is then brushed onto the evidence to develop the print.
What is the purpose of the plunger in the magnetic brush?
-The plunger in the magnetic brush is used to release the powder back into its receptacle after use, allowing for cleanup and reuse.
What type of powder is used in the video demonstration?
-The video uses Lin PV powder for the demonstration on textured items.
Why is it problematic to lift prints from textured surfaces using regular hinge lifters or flat tape?
-Using regular hinge lifters or flat tape on textured surfaces can result in missing a lot of ridge detail because these methods do not get into the grooves of the textured items.
What alternative lifting technique is suggested for textured surfaces in the video?
-The video suggests using gel tape, specifically diff lift tape, which can be pushed into the grooves of the textured surface to capture more ridge detail.
What is Accu trans and how is it used in fingerprinting?
-Accu trans is a technique normally used to capture marks impressions from pried open doors or windows, but it can also be used for fingerprints by moving it around on the print to ensure it gets into all the grooves of a textured surface.
Can magnetic powder be used on smooth surfaces as well?
-Yes, magnetic powder can be used on smooth surfaces, and in such cases, regular standard tape or a hinge lifter can be used for lifting the prints.
What advice does Mike McCutcheon give for successful fingerprint processing?
-Mike McCutcheon advises to practice using magnetic powders and different lifting techniques to achieve success in fingerprint processing.
How can viewers get more tips and tricks on fingerprint processing?
-Viewers can get more tips and tricks by visiting the Lin PV comm website or by emailing Mike McCutcheon directly.
Outlines
🔍 Introduction to Magnetic Powder Fingerprint Processing
In the introductory paragraph, Mike McCutcheon, the host of the forensic education series, welcomes viewers and introduces the topic of using magnetic powder for processing fingerprints on textured surfaces. He explains his preference for magnetic powder over traditional fingerprint powder due to its effectiveness on textured surfaces and ease of use for new investigators. Mike also compares different powders, emphasizing the importance of using the finest powder for better fingerprint development. He demonstrates the application of magnetic powder using a magnetic brush and explains the process of developing and cleaning up after fingerprinting various textured items, such as vinyl siding, an orange, a piece of wood, and a mug.
🎨 Advanced Techniques for Developing and Lifting Prints
This paragraph delves into advanced techniques for developing and lifting fingerprints using magnetic powder on different surfaces. Mike demonstrates how to apply magnetic powder to the inside of a glove to reveal ridge detail and discusses the limitations of using flat tape on textured surfaces, which can result in losing ridge detail. To overcome this, he introduces the use of gel tape, specifically diff lift tape, which can be pressed into the grooves of a surface to capture more detail. Another technique showcased is the use of Accu trans, typically used for tool marks but also effective for fingerprints on textured surfaces. Mike illustrates how to apply Accu trans and emphasizes the importance of allowing it to dry properly to capture ridge detail effectively.
📋 Conclusion and Advice on Fingerprint Processing
In the concluding paragraph, Mike wraps up the video by summarizing the techniques discussed for processing fingerprints using magnetic powder and different lifting methods. He advises viewers to practice these techniques to achieve success in fingerprint processing. Mike also invites viewers to visit the Lin PV website for more tips and tricks and offers to answer any questions via email. The paragraph ends with a reminder that the techniques shown are not only applicable to textured surfaces but also to smooth surfaces, highlighting the versatility of magnetic powder in forensic evidence collection.
Mindmap
Keywords
💡Forensic Education
💡Magnetic Powder
💡Textured Surfaces
💡Fingerprint Powder
💡Magnetic Brush
💡Lin PV Powder
💡Ridge Detail
💡Diff Lift Tape
💡Accu Trans
💡Practice
Highlights
Introduction to the use of magnetic powder on textured surfaces for evidence processing.
Magnetic powder is preferred over traditional fingerprint powder for textured surfaces and is easier for new investigators to master.
The importance of using the finest powder possible for better fingerprint quality.
Magnetic powder is applied with a magnetic brush, which attracts the powder to the brush tip for application.
Different techniques for lifting prints from textured surfaces to avoid missing ridge detail.
The use of Lin PV powder for processing textured items like vinyl siding, an orange, and a piece of wood.
Magnetic powders are available in different colors to suit various evidence surfaces.
Demonstration of developing a fingerprint on a textured orange using magnetic powder.
The use of grey magnetic powder for developing prints on dark-colored objects like a mug.
Magnetic powder can also be used on plastic and rubber surfaces, demonstrated with a glove.
Different lifting techniques for textured surfaces, emphasizing the limitations of flat tape.
Introduction of gel tape or diff lift tape for better ridge detail recovery from textured surfaces.
The use of Accu trans for lifting prints from textured surfaces, such as an orange or vinyl siding.
The drying time for Accu trans and the resulting ridge detail after peeling it off.
Magnetic powder can also be effectively used on smooth surfaces, demonstrated with a mug.
The use of standard tape or hinge lifters for lifting prints from smooth surfaces.
Advice on practicing with magnetic powders and lifting techniques for success in evidence processing.
Encouragement to visit Lin PV comm for more tips and tricks, and contact information for further questions.
Transcripts
hi welcome back to forensic education
series I'm Mike McCutcheon and I'm going
to be your host today in this episode
we're going to cover one of my favorite
evidence processing techniques using
magnetic powder on textured surfaces and
so you asked why do I like magnetic
powder
well magnetic powder work better on
textured surfaces than traditional
fingerprint powder
I've also find with new investigators
and students that it's easier to master
the skills of magnetic powder quicker
than using traditional fingerprint
powder now before we begin I'm going to
compare two different powders because
powders aren't created equal if you look
at the difference of these two powders
this powder here is much more coarse the
powder here is much finer the finer the
powder the better your fingerprint is
going to be because it's going to be the
powder that's actually touching your
print so we want to make sure that we
use the finest powder possible now
magnetic powder is applied with a
magnetic brush the magnetic brush has a
magnet in the tip and when brought
towards the magnetic powder it's going
to attract the powder onto the tip of
the brush and then you would brush it on
your evidence to develop your print when
you're done you're going to pull the
plunger to let the powder fall back into
its receptacle go back and clean up and
there you have your print now the prop
the powder that we're going to use today
is going to be a Lin PV powder and I
have some textured items here that we're
going to process the problem with using
textured items is when you lift those
prints if you use regular hinge lifters
or flat tape you're going to miss a lot
of your Ridge detail now the items that
I have here are textured
products so we have some vinyl siding we
have an orange we have a piece of wood
and we also have a smooth object a mug
just like regular traditional
fingerprint powders magnetic powders
come in different colors so I'm going to
start with our vinyl siding put the
applicator to the powder I'm going to
brush over our items now I'm going to do
this more than once because I'm going to
show you some different techniques to
lift these once we've developed I'm
going to go back and do our cleanup
so now we're going to try to develop a
print on an orange it's a textured
surface there's lots of grooves in it
we're going to try with our magnetic
powder
oK we've processed our orange then we'll
go back and clean up
now we also have the mug the mug here is
dark-colored so we're not going to want
to use our black powder so we're going
to use a grey powder magnetic power
comes in all different colors it comes
in the fluorescent so you would need
your alternative light source to view it
but we're just going to use a grey
powder to develop our prints on our dark
mug lightly brush now we see that our
print is developed do our cleanup and we
have our print now I've also found that
you can use magnetic powder on plastic
in rubber so what we're going to do is
we're going to try to develop a print on
the inside of a glove so we'll take our
scissors I'm going to cut our glove
so that the inside is exposed we're
going to take our magnetic powder going
to apply it to the inside of the glove
just as we would any other object
we'll go back and do our cleanup now you
can see the ridge detail in the glove
here and in the glove here now that
we've developed our prints on different
objects we're going to use different
techniques to lift them now if you use a
flat regular tape to try to lift a print
off a textured surface you're going to
miss a lot of that Ridge detail I'll
show you what I mean so this is our
regular tape we have our print here on
the siding I'm going to lift it I'm
going to place it on the backing now
what you'll see is we left a lot of our
finger print on the vinyl siding because
it didn't get down into the grooves of
the siding so we left a lot of our
evidence behind the solution to that is
we're going to use a gel tape this is
diff lift tape so instead of just laying
on top of the fingerprint we're going to
be able to push this into the grooves of
the tape I'm going to cut our piece now
it's important when we're putting our
different because once we push this onto
our backing card you want to make sure
that there's enough adhesive I still
left on the tape to stick to your
backing card so we're going to push that
into the grooves I'm going to stick that
to our backing card
now you can see the difference between
the DIF tape and how much detail we have
compared to using a flat standard tape
now another technique that you could use
either on the siding or on the orange is
we're going to use the Accu trans now a
cue trans is you normally use to get to
marks impressions off of a door or a
window that's been pried open but you
can also use it for fingerprints so
we're going to put our tip on and today
I'm just using a white so we're going to
locate our fingerprint you're going to
move it around on your on your
fingerprint to make sure it gets into
those grooves and orange is very
textured so there's lots of dips and
grooves you can also use it on the vinyl
siding and we're going to do the same
I'm going to make sure we're moving it
around not touching the print button
sharing that it's getting into all the
grooves
now the active trans is going to take
about two to four minutes to dry I have
one here that we've already dried that I
put on before we started I'm going to
peel that back and now you can see the
ridge detail that's left now as I've
stated before you can use your magnetic
powder on smooth surfaces as well we did
our cup here with the lighter gray
powder instead of the black it's a
smooth surface so that you can use a
regular standard tape or a hinge lifter
so now we've processed our products
we're ready to send them to the lab we
use different techniques using the diff
lift tape and using the Accu trans the
best advice I can give is to practice
practice using your magnetic powders and
your different techniques of lifting and
you will be successful you can catch
more tips and tricks on Lin PV comm and
if you have any other questions you can
email me at M McCutchen at Londonderry
NH org thank you
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