[myraqureshi]

No pH drift as such for the one in question.

However this is a good point. Because we made approx 20 samples over time (all over a year ago) which thankfully were still lying around. One sample which is VERY brown in colour has a pH of 8 as of today. The rest have same pH. 

Very strange. Can’t remember how that happens. 

What can we add in an aqeous formula so that pH doesn’t drift ? Never done this before. Sodium Glutanate ? What would you recommend ? Thank you for your help and comments thus far. 

[myraqureshi]

It was a small batch made for there give aways. It was challenge tested which is why we are stumped. pH is 5.5. Cheating agent is EDTA. Carbomer is ELT 20 which needs to be neutralized via TEA 

[myraqureshi]

Gunther said:

myraqureshi said:

a year and half later we have found that after a year, it turns brown.  

Was the product marketed without a previous challenge test?

Try making a test formulation preserved with high levels of parabens to see if the brown thing is the preservative failing, or actually oxidation or degradation.

[myraqureshi]

vjay said:

you need to use perfume with standard suppliers like IBERCHEM, ROBERTET, ETC.., You should also ask perfume supplier for the IFRA & Allergen Certifiacate and in IFRA you are able to see the dossage of your perfume in your product.

[myraqureshi]

Microformulation said:

When did EDTA become viscosity controlling? What did I miss?

Sorry that’s a faux pas. It’s chelating agent. 

[myraqureshi]

Thank you very much lovely people.
we removed Guar because it was being grainy as well (even after adjusting for lower pH)
 

We have added cetyl alcohol 2 percent and have also increased glyceryl monostearate and CTAC Looks better but scared what will happen once we homogenize in production. Currently stability testing and will come back with more news

THANK YOU 
you guys are awesome 

[myraqureshi]

Can someone tell me how I can thicken the above without Guar then?

[myraqureshi]

The same formulation below without Guar is “thin”

Water Phase
Aqua Q/S
Guar 1%
PG 2%
EDTA 0.3%
Aloe Vera Gel 0.5%
Allantoin 2%
Cetrimonium Chloride 0.5%

Oil Phase
Crodamol STS 3%
Crodamol Ab 1%
Cetostearyl Alcohol 4%
Jojoba Oil (macerated with Hibiscus and Moringa) 0.5%
Cetyl Alcohol 2%
Glyceryl monostearate 1.5%
Stearic Acid 0.5%   (added to try and thicken)

Phase C
D Panthenol 0.5
Ethylhexlyglycerin & Phenoxyethanol 1%