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 Leather Chemists : Leather Discussion
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cbblackie3
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Posted: 11 June 2012 at 10:46am | IP Logged Quote cbblackie3

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

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

I am checking it again. As I remember that area become darker and duller. But I do not believe my memory.
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seogsoo
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Posted: 20 June 2012 at 4:27am | IP Logged Quote seogsoo

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

And brown shade on light color leather 

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rramachandran_1
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Posted: 27 June 2012 at 9:47am | IP Logged Quote rramachandran_1

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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cbblackie3
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Posted: 27 June 2012 at 2:57pm | IP Logged Quote cbblackie3

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

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

Hi Chris

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

Regards

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cbblackie3
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Posted: 28 June 2012 at 7:49am | IP Logged Quote cbblackie3

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

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
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cbblackie3
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Posted: 04 July 2012 at 12:13pm | IP Logged Quote cbblackie3

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

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

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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