adrian2022

11 hours ago, studiot said:

Here is a ph calculator for  HCl solutions

https://www.oxy.com/globalassets/documents/chemicals/products/chlor-alkali/tech-calculated_ph_values_hcl.pdf

I dont know how to calculate my ph, But i did another test on a pice of tumeric root and it turned pink also, Must be some contaminants in my hci or something else,

Found another test for metanil yellow but in pigeon peas https://www.studyrankers.com/2016/06/test-the-presence-of-starch-and-metanil-yellow.html

1 minute ago, studiot said:

I tried some old turmeric from my spice drawer in some Tesco limescale remover.

Unfortunately this limescale remover has a bright blue dye so the result was a bright green solution, with no hint of red.

 

The concentration of HCl is stated as 6.75g per 100g so appears a bit weaker than yours. I will have to calculate it's pH.

 

That is the best I can do on a Sunday evening.

Ok thank you for your help and time, I will go and buy another brand of tumeric  and test it, I forgot to mention that if i add water to the solution it goes back to light yellow

15 minutes ago, studiot said:

I don't have colours below pH 2, but will try the experiment.

The above is from my link

Have you tried this with turmeric from any other source ?

Yes i tried my curcumin extract supplement and got the same result

2 minutes ago, studiot said:

Well the pH of 30% HCl is less than 1 and MY turn from yellow at pH 2 to red at pH 1 so it could be present, depending upon how much  HCl you added.

 

Do you know the source of your turmeric or its physical form ?

Its from my grocery store, I added tumeric to a container of hci not hci to tumeric if that matters, i took 2 picutures, second picture is with more tumeric added

Hi, Sorry if my english is bad, I read that tumeric can be tested for Metanil yellow with hydrocloric acid, I used 30% hcl and added some tumeric and it turned pink, Added some more and it tured red :/ does my tumeric contain Metanil yellow?