> MIKROSIL 

Multipurpose Casting Agent

Use MIKROSIL on
Fingerprints
– Lift CNA-developed prints
– Lift fingerprints in blood
– Identify cadavers
Shoeprints
– Lift shoeprints in blood
– Lift brushed shoeprints
Toolmarks
– Double cast toolmarks
– Smudging
– µm toolmarks

> Lift brushed shoeprints

To start, gently apply the powder to the floor to developing a latent impression by sweeping the brush in a back and forth motion. This allows the brush to slightly touch the top of the floor.

After developing a latent impression remove the excess powder by blowing on the surface.

Photograph as safety precaution in case the evidence is lost during the recovery stage.

To save shoe prints, start by cutting out silicon paper for the foot print.

The paper must overlap the entire shoe impression.

Tape the silicon paper to one side and attach it to the floor next to the footprint so the paper can lie still.

Mix the base material and hardener quickly until a uniform color results. Limit mixing time to 20-30 sec.

Apply the mixture on the floor behind the of the footprint.

Roll out the silicon paper over the mixture with the rolling pin

Continue Roll out the mixture as evenly as possible over the entire footprint.

Let it harden 10 to 15 minutes. Be patient it is better to wait a little longer.

Now just grab the silicon paper and pull it off that from the floor and the footprint is stuck in the Mikrosil mixture.

> Lift fingerprints

We have a fingerprint on a glass that we have carefully developed by applying powder to the glass with a brush.

Start by cut out silicone paper saw that it covers the fingerprint that is on the glass.

Tape the silicon paper to one side and attach it to the glass next to the fingerprint so the paper can lie still.

Mix the base material and hardener quickly until a uniform color results. Limit mixing time to 20-30 sec.

Apply the Mikrosil mixture to the fingerprint sits on the glass.

Roll silicon paper over the mixture as evenly as possible over the glass and fingerprint.

Let it harden 10 to 15 minutes.

Now after 15 minutes just grab the silicon paper and pull it off that from the glass and the fingerprint is stuck in the Mikrosil mixture.

Here is the result of fingerprint and that is photographing with polarisationsfilter.

> Tool marks. Cast of knife blades holes

Here we have a hole where a knife has punctured a tire and we have the suspect knife with which we will compare.

We want to see if a seized knife was used to create that hole in the tire.

So we make another hole with the suspect knife for compare this two holes.

Mix together the Mikrosile and the hardener. Apply the mixture to the tire, the mixture should go through the hole. Do the same with the new holes created with the suspect knife.

After 10-15 minutes, remove the two castings from the tire.

Cut out the Casting with scissors as shown in the picture

Now we have two castings that we can compare with if it is the same knife that made that hole in the tire and we do that with under a comparison microscope.

Here you can now clearly see in a comparison microscope from the two castings that it is the same knife that made the hole in the tire.

> Toolmark Methods

What are striation, impression and reference marks? This short introduction to toolmark examination covers the most basic elements. Toolmarks are very common evidence at crime scenes.

When a door is forced open by a screwdriver or a crowbar, high quality marks are often left behind and can help the investigator identify the tool that was used.

To investigate whether a screwdriver has been used at the crime scene, we create reference marks using the suspect tool. 

We have already made a casting with MIKROSIL at the crime scene of a break mark that we will make a comparison with the suspect screwdriver.

Reference striation marks can be made with lead plates, but our preferred alternative is to use a wax plate. Most often, wax plates reproduce microscopic details with higher quality.

Create a reference mark on a wax plate with a screwdriver that we will cast with MIKROSIL and compare under a microscope with the tool mark from the crime scene.

There are two types of toolmarks which are valuable when establishing an identity: striation and impression marks.

Over time, the contact area of tools like screwdrivers, knives or crowbars is worn down by friction, creating a unique pattern on the surface of tools.

Mix together the Mikrosile and the hardener. Apply the mixture to the wax plates and Let it harden 10 to 15 minutes.

applying mikrosil brown to toolmark comparison wax plate
Here is the reference mark from wax plate that cast by the MIKROSIL and now we can compared under a microscope with the tool mark from the crime scene.

Here you can now clearly see in a comparison microscope from the two castings that it is the same screwdrivers that made impression from the crime scene.

>Double cast toolmarks

Establishing an identity from impression marks.

To investigate whether a crowbar has been used at the crime scene, we create reference marks using the suspect tool.

We have already made a casting with MIKROSIL at the crime scene of a break mark that we will make a comparison with the suspect crowbar.

First, cast the interesting surface areas of the tool with SP Impgregum.

When using the SP Impregum for the first casting, the second casting can only be made with a Type C silicone, like Mikrosile.

Apply the SP Impregum and Let it harden and after that remove the castings from the crowbar.

Mix together the Mikrosile and the hardener.

Apply the mixture to the SP Impregum and Let it harden 10 to 15 minutes.

After that remove the Mikrosile castings from the SP Impregum.

Now we can compare double castings from the crowbar and we compared that with the tool mark from the crime scene.

Here you can now clearly see in a comparison microscope from the double cast toolmarks and that it is the same crowbar that made impression from the crime scene.

The tracks on the left are breakmarks from the crime scene and on the right are the double cast of the break end of the crowbar.

>Double cast of drill

To investigate whether a drill has been used at the crime scene, 

In this case, a circular saw with a drill at the center was examined to see whether it had been used on the  metal security box.

We double cast the suspect drill and apply Mikrosile mixture in to the drilling hole.

To Establishing an identity from drilling marks.

It can be done with the hole at the crime scene where you can find marks in the material that you can compare with the drill.

First, cast the interesting surface areas of the drill with SP Impgregum.

When using SP Impregum for the first casting, the second casting can only be made with a Type C silicone, like Mikrosile.

Apply the SP Impregum and Let it harden.

 

 

After a while when they have solidified remove the SP Impregum from the drill.

Mix together the Mikrosile and the hardener.

Apply the Mikrosile mixture to the SP Impregum at drill sida and Let it harden 10 to 15 minutes.

Next apply the Mikrosile in to the hoole and Let it harden 10 to 15 minutes and remove from the drill hole. 

After 10 to 15 minutes. when they have solidified remove the SP Impregum from the Mikrosil.

Here you can now see in a double casting of the drill.

Now we can compare the drill casting and the drilling hole casting  in the comparison microscope. 

Here you can now clearly see in a comparison microscope from the double cast of drill and the hole that made impression from the crime scene.

The casting showed a small impression mark at the point where significant force had been applied to bend open the box. The size of this mark was roughly 0.3 x 0.5 mm.

The super imposition technique applied during the microscope comparison showed many matching details between the double casting of the drill and the casting of the drill hole.