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cbblackie3
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Joined: 02 November 2010
Location: United States
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Posts: 107

Posted: 11 June 2012 at 10:46am \| IP Logged

You never mentoned whether or not the stain shows up after coloring

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Chris Black
Black's It Consulting

seogsoo
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Joined: 15 August 2005
Location: Korea, South
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Posts: 843

Posted: 15 June 2012 at 12:38am \| IP Logged

I am checking it again. As I remember that area become darker and duller. But I do not believe my memory.

seogsoo
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Location: Korea, South
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Posts: 843

Posted: 20 June 2012 at 4:27am \| IP Logged

I confirmed. It shows a bit dull shade on black leather

And brown shade on light color leather

rramachandran_1
Senior Member

Joined: 28 September 2005
Location: India
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Posts: 396

Posted: 27 June 2012 at 9:47am \| IP Logged

Dear Technologist from China,

Does the chrome powder manufactured in China is trust
worthy? or is there any chance that the stains were formed
due to low quality of Chrome powder available in China? In
India I am yet to find a Tanner who has imported Chrome
from China.

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rramachandran

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cbblackie3
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Joined: 02 November 2010
Location: United States
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Posted: 27 June 2012 at 2:57pm \| IP Logged

You should try using a sequestering agent in the pickle to elliminate the stains. Try an EDTA

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Chris Black
Black's It Consulting

seogsoo
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Joined: 15 August 2005
Location: Korea, South
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Posts: 843

Posted: 27 June 2012 at 10:09pm \| IP Logged

Hi Chris

So you are considering it as iron. Am I right?

Regards

cbblackie3
Senior Member

Joined: 02 November 2010
Location: United States
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Posts: 107

Posted: 28 June 2012 at 7:49am \| IP Logged

Yes I am.

Consider doing the work with a sequestering agent to see what impact it has. On the positive side you will not be causing any process problems as apart from adding cost to your process you can certainnly either solve this problem or move onto reseaching another solution to this problem.

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Chris Black
Black's It Consulting

seogsoo
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Joined: 15 August 2005
Location: Korea, South
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Posts: 843

Posted: 04 July 2012 at 2:52am \| IP Logged

I just checked it. It is more obvious at the fold area. It can not be washed out by acid. Innitial color of stain start from green and chagnged to brown or orange.

So this is fungus.

This happens to

even fungicide is added
not only sugar reduced but SO2 reduced chrome as well

cbblackie3
Senior Member

Joined: 02 November 2010
Location: United States
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Posts: 107

Posted: 04 July 2012 at 12:13pm \| IP Logged

You atre screwed if it is fungus as it is vertually impossible to get rid of this strain.

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Chris Black
Black's It Consulting

dengwja
Senior Member

Joined: 25 January 2006
Location: China
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Posts: 688

Posted: 07 July 2012 at 10:39pm \| IP Logged

Dear rramachandran,

No one from China asks you to use that chrome. You can even image such poor qualitified chrome are salt with dyestuff. Please donot use this chrome in your recipe, otherwise, you will have a only excuse for bad result from trial.

Regards

Dengwja

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