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Phenolic yellowing issues
We have been facing yellowing on the fabrics kept at stores,all the test results were passing like PH,Phenolic yellowing,Formaldehyde,Light and BGF but we couldn;t come to an solution .Hence we have finally kept the fabric exposed in sunlight for a day and found that it has totally became yellow in the exposed area.So please advise whether the fabric stored can be wrapped with a opaque cover and also in the dark room to avoid the issue. 1 month ago

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SureshUnfollow Follow Suresh
Suresh Kumar • Your fabric is definately containing some chemicals and its Ph is not neutra.; The test done by you is not correct. You may send your fabric sample to our lab for correct test and evaluation. We can definately suggest a solution. Dyetech Consultants ( Testing Lab Division} 98 Ind Area A Ludhiana. PH 08528806039, India 1 month ago • Unlike • Like

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ShaileshUnfollow Follow Shailesh
Shailesh Shah • what kind of fabric, Is it 100% cotton or other blend? 1 month ago • Unlike • Like
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DanUnfollow Follow Dan
Dan Koshak '50 • Check your softeners used
1 month ago • Unlike • Like
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JayakumarUnfollow Follow Jayakumar
Jayakumar Gopalakrishnan • The possibilitiess are 2.

1. The store illuminant is damaging the OBA , Fluorescent illuminants contain UV and can be quite damaging, especially the new CFL lamps. 2. The fabric was not neutralized properly, the ISO pH test does not show up bad neutralization as well as the AATCC tests does. We have done several correlations and have sufficient data to prove this.

Most mills will check the last bath water and fabric surface for pH , they dont use the correct method to calculate the acid/buffer required to neutralize the fabric ( PKa PKb) , and hence may have unloaded at 6 or 6.5, but the Alkali in the core would first come out when squeezed in the Padder and will form salts with the cationic softener, which can be checked by scoring the fabric and checking for white lines. Further on storage this alkali damages the OBA and causes yellowing. If the yellow is lemon then it is phenolic if it is a redder yellow or what is called Golden than it is alkaline. One must also factor for the volatility of Acetic aci if that was used for neutralizing. 1 month ago • Unlike • Like

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AbhishekUnfollow Follow Abhishek
Abhishek Jadhav • 1) Dear Ganesh I will just ask you to check core pH of your fabric after Application of OBA. for Core pH just boiled a piece of fabric at 98 C for 30 min in distilled water. Allow the solution to cool. Check the pH with the calibrated pH meter.

2) Now if you find your core pH to be highly acidic , I will suggest you to used a Sera Con M-TC from DyStar during your neutralization stage , which is a buffer. Thus even if the pH is not neutralized completely M-TC will not allow the alkaline pH of fabric to change beyond 6-6.5.

3) Even after then if you faced phenolic yellowing problem, there is anti yellowing agent namely sera protect N-APY from Dystar. Just pad the fabric and your yellowing problem would be solved.

In case of any further support kindly contact me " jadhav.abhishek@dystar.com" 1 month ago • Unlike • Like
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JayakumarUnfollow Follow Jayakumar
Jayakumar Gopalakrishnan • I...
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