Judge Massei Sentencing Report     The Meredith Kercher Fund     The Murder Of Meredith Kercher Wiki     True Justice For Meredith Kercher     Judge Nencini Sentencing Report 


Last visit was: Wed Sep 20, 2017 7:27 am
It is currently Wed Sep 20, 2017 7:27 am
All times are UTC

PHENOLPHTHALEIN PRESUMPTIVE BLOOD TEST

Moderators: Nell, Ergon, nicki, Michael, Forensics Moderator, Moderators


 Page 1 of 1 [ 1 post ]
Author Message

Offline Michael

Site Admin


User avatar


Joined: Sun Jan 20, 2008 7:06 pm

Posts: 16732

Location: England

Highscores: 113

PostPosted: Fri Dec 18, 2009 12:08 am   Post subject: PHENOLPHTHALEIN PRESUMPTIVE BLOOD TEST   

PHENOLPHTHALEIN PRESUMPTIVE BLOOD TEST


The infamous pictures posted in early media articles on the case showing the small bathroom apparently drenched in blood, were actually of the bathroom after phenolphthalein had been applied. It is a chemical that is used to detect invisible (cleaned) blood and is sometimes used in place of luminol, as luminol can cause damage to any DNA evidence contained in the blood or on the surface areas around it. Phenolphthalein turns pink in colour on contact with blood:

Quote:
Phenolphthalein is used to perform a presumptive blood test, and is commonly known as the Kastle-Meyer test. A dry sample is collected with a swab or filter paper. First a few drops of alcohol, then a few drops of phenolphthalein and finally a few drops of hydrogen peroxide are dripped onto the sample. If the sample turns pink then it is a positive test. This test is nondestructive to the sample; it can be kept and used in further tests at the lab. This test has the same reaction with blood from any animal, so further testing would be required to determine whether it originates from a human.


WIKIPEDIA


KASTLE-MEYER TEST
Top Profile E-mail 
Display posts from previous:  Sort by  
 Page 1 of 1 [ 1 post ]


Who is online
Users browsing this forum: CommonCrawl [Bot] and 0 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

  

Judge Massei Sentencing Report     The Meredith Kercher Fund     The Murder Of Meredith Kercher Wiki     True Justice For Meredith Kercher     Judge Nencini Sentencing Report 


28,890,270 Views