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Mordant

mordant

1. Any corroding substance used in etching.

2. Any substance, as alum or copperas, which, having a twofold attraction for organic fibres and colouring matter, serves as a bond of union, and thus gives fixity to, or bites in, the dyes.

3. Any sticky matter by which the gold leaf is made to adhere.

Origin: F, originally, biting.


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Gram Stain?

Iodine (mordant) forms complex with crystal violet that cannot be washed out from gram +ve cells because of thick layer of peptidoglycan.

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by Cat
Wed Feb 27, 2008 4:59 pm
 
Forum: Microbiology
Topic: Gram Stain?
Replies: 3
Views: 3120

Re: Gram Stain?

It's a mordant. It forms an insoluble complex with the primary Gram stain, crystal violet or methylene blue, and helps keep the dye stay put once it has bound to wherever it binds. It probably also adds something to the color, ...

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by blcr11
Wed Feb 27, 2008 4:55 pm
 
Forum: Microbiology
Topic: Gram Stain?
Replies: 3
Views: 3120

Iodine in Gram staining

iodine acts as a mordant. it sets the stain see what I mean Kell? The answers that may be posted may lead to more questions like what is a mordant and what does "sets the stain" mean? The answer by nisanjlk is perfectly ...

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by mkwaje
Sun Sep 17, 2006 11:33 am
 
Forum: Microbiology
Topic: Iodine in Gram staining
Replies: 4
Views: 4240

Iodine in Gram staining

iodine acts as a mordant. it sets the stain

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by nisanjlk
Sat Sep 09, 2006 2:49 am
 
Forum: Microbiology
Topic: Iodine in Gram staining
Replies: 4
Views: 4240


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