STK Lab

STK Lab

Impregnated paper for fabrics screening
within the lab

What is STK Lab?

Mapping technics often use toxic reagents that are time consuming and dangerous to use both for DNA and the operator. Alternate Light Sources are known for generating lots of false positives and also... false negatives.

As semen is most of the time deep in the fabric, STK Lab pre-impregnated paper is the most efficient solution to find semen traces on any textile evidence.

STK Lab is ready to use, non-toxic, highly sensitive and specific to semen. It is the perfect solution to screen clothes, bed sheets and textile evidences.

Fully compatible with DNA extraction techniques, STK Lab is being used in routine in crime laboratories in the world for several years now and helped to solve thousands of rape cases.

We’ve had excellent service from AXO Science over the past five years. We started with validating the STK Lab and have now moved on to the STK Spray too. We’re interested in using it for casework and the results have been promising for source level cases

L. Reaney, Forensic Scientist & Teaching Fellow, University of Strathclyde, Royal College (UK)

We have tested STK Spray and STK Lab on simulated and real samples and have had positive results in both cases. We believe these products are valuable for forensic laboratories analysing sexual assault cases

Sandra Cristina Costa, Head of Biology and DNA Division - Forensic Science Laboratory (Portugal)

I have been able to use STK Spray and Lab in high-profile cases and I have also used it in cases after 6 months of committing the crimes and always I had excellent results.

Carlos A. Gutierrez, Ph.D. Assist. Professor - International Forensic Consultant of TFS (USA)

Both the STK Lab and Spray worked very well. I tested the products on undilute semen stains on a laminate tile and two dark polyester fabrics. The fluorescence was quickly and clearly visible.

Sam - Houston State University (USA)

Tested in parallel with Crimescope (CSS filter and orange and red glasses) STK Sperm Tracker clearly showed its ability to overcome fabric constraints (improved sensitivity) and to carry out two operations in one: both pinpoint stains and reveal their acid phosphatase activity. More reliable, faster and easier to set than the method currently in force within the INPS, STK Sperm Tracker represents a real step forward in the forensic field.

Emilie B. & Céline P. – Forensic Identification Specialists SNPS – LPS69 (France)

Available products

To be able to buy from our shop, please first register, or log-in if you already have an account.

STK Lab 40m

STK Lab 40m

Sperm Tracker impregnated paper for fiber and textile evidences

STK Lab is a presumptive test for the...

STK Lab 10m

STK Lab 10m

Sperm Tracker impregnated paper for fiber and textile evidences

STK Lab is a presumptive test for the...

STK Lab A3x20

STK Lab A3x20

STK Sperm Tracker impregnated paper for fiber and textile evidences

STK Lab is a presumptive test for the...

STK Lab SAMPLE

STK Lab SAMPLE

STK Sperm Tracker impregnated paper for fiber and textile evidences

STK Lab is a presumptive test for the...

UV Light VILBER VL-6.L-EU

UV Light VILBER VL-6.L-EU

Gold standard UV lamp with STK solutions

At the end of every STK solutions protocols, during the revelation...

UV Goggles

UV Goggles

Transparent goggles with UV filter to be used when using UV light

Transparent UV goggle to protect your...

Press device

Press device

Pneumatic Press Device 150 cm x 92 cm working space

STK Lab impregnated paper requires strong and even...

Positive Control x 10

Positive Control x 10

Positive Control x 10

Box of 10 Positive Control

Positive Control to be used with STK Lab, STK Spray...

UV Light VILBER VL-6.L-US

UV Light VILBER VL-6.L-US

Gold standard UV lamp with STK solutions

At the end of every STK solutions protocols, during the revelation...

STK Lab 7045x15

STK Lab 7045x15

STK Sperm Tracker impregnated paper for fiber and textile evidences

STK Lab is a presumptive test for the...

Where to buy

How to use STK Lab?

Using a sprayer, wet absorbing side of a piece of STK with demineralized water
1

Using a sprayer, wet absorbing side of a piece of STK with demineralized water

Cover area to be tested with wet absorbing side against item. It is possible to analyse both sides at the same time by sandwiching the item
2

Cover area to be tested with wet absorbing side against item. It is possible to analyse both sides at the same time by sandwiching the item

Press for 3 minutes
3

Press for 3 minutes

Read results with a UV light (365-366nm). Only semen stains with glow in a blue color
4

Read results with a 365 nm UV light. Only semen stains with glow in a blue color.

Use a positive control to validate your experiment

Frequently Asked Questions

Is STK Lab toxic?

Unlike classic AP spot test, STK Lab is absolutely not toxic for the user.

Is STK Lab damaging DNA?

No, STK Lab is not damaging DNA and is fully compatible with extraction techniques.

ALS are simple to use and faster, why should I use STK Lab?

ALS are known for generating lots of false positives that are time and money consuming to discard. Faster you said? Sure? But worse, ALS are also generating lots of false negatives! Internal studies for our customers revealed best ALS are missing >30% of semen stains…

Wet paper is curling, how can I do?

You can pin evidence with STK Lab paper. You can also “sandwich” the evidence with STK Lab paper to do both side in the same experiment, pin evidence and staple both side of STK Lab paper together.

I don’t have a press device, what can I do?

Many labs are in this situation. We developed a press device, you can contact us at sales@axoscience.com. You can also use a board of wood / glass with some foam to “absorb” hard pieces such as zipper or button and then put some weight on top of it.

Can I use any UV light?

No, you have to use a 365nm UV light with visible light filter. Not every 365nm UV light give great results, please use a positive control to validate your UV light. We can recommend some specific 365nm UV lamp if needed.

Documentation for download

STK LABProduct datasheetSTK LABUser GuideSTK LABMSDSSTK Lab protocol pressSTK Lab protocol