98 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



and will not get enough acid and it will make a difference. 

 The white color comes from too low action of the acid. 



Q: — In using steam tester won't that make a difference? 



A : — You are liable to get it too hot. The steam that is run- 

 ning the tester getting into the chamber where the bottles are 

 and are liable to get burnt fat, more liable than with a hand 

 tester. But still never have any trouble with the new machines 

 if properly made. It is not so particular about the amount of 

 acid but the amount of milk. I can tell when that goes into 

 the milk by the color it turns it. A little greenish tinge under 

 that milk and that is the true color, the proper color of the acid 

 in the milk as it comes together. As we stir that up we have the 

 action giving the darker color and we find that this gets hot. 

 It ought to be a little more dark (referring to test) but I think 

 we will get a pretty fair test. It is rather cool in here to use this 

 kind of a tester. 



I am going to put a drop of formaldehyde in the next 

 sample. I am going to put a drop of formaldehyde test, I will put 

 a drop in. These preservatives, iceline, milk sweet, etc., formal- 

 dehyde is the basis of nearly all these preservatives. 



The agent says you can use this preservative and that it 

 can't be found, and it makes the milk keep sweet anc^ it is all the 

 better for the people. That is how the agent talks the daii-y- 

 man into using it very often. 



You see the color? No reason why your judgment should 

 not tell you whether there is formaldhyde in it or not. When 

 you put in the acid you see it gets a deeper purple ring. Buying 

 milk from anyone you can make the test in a minute and know 

 whether there is any preservative in it or not. That test will 

 show one part formaldehyde to 500,000 of milk. No dairyman 

 can put it in such small quantities so you cannot detect it. 



Q : — Will ordinary sulphuric acid do that ? 



A: — You must have a little iron sulphate in the acid. 



0:There wouldn't be that much in the milk? 



A : — No not as much as I have here. This is stronsf, of 

 course. You buy four per cent solution and I think it is the 

 same strength. I mix water with mine. 



