. An introductory course of lessons and exercises in chemistry (rewritten 1919). value due to the fact that they donot reveal the extent of the adulteration. Slight amounts of adul-teration are often negligible, and hence only the quantitative testis of value. The principal tests are (a) Iodine absorption num-ber, (b) Maumene specific temperature reaction, (c) specific grav-ity, and (d) some qualitative tests such as color and odor tests. - - z „»ti : :::iv I zi:;:-i37 - - ?- ..-.;-- -- . : .:.; :Ii- :; --. 7— :: r : : ? - . • . • - I; - T^.r:: : .; - . .; -T :. -:: - :? 111r»: .-
. An introductory course of lessons and exercises in chemistry (rewritten 1919). value due to the fact that they donot reveal the extent of the adulteration. Slight amounts of adul-teration are often negligible, and hence only the quantitative testis of value. The principal tests are (a) Iodine absorption num-ber, (b) Maumene specific temperature reaction, (c) specific grav-ity, and (d) some qualitative tests such as color and odor tests. - - z „»ti : :::iv I zi:;:-i37 - - ?- ..-.;-- -- . : .:.; :Ii- :; --. 7— :: r : : ? - . • . • - I; - T^.r:: : .; - . .; -T :. -:: - :? 111r»: .- r--,^. L - irT:: :!- :-?:.-- ~H 1 •.-: -r-z: :I:.i: •- •:-— -• -• - : ; _-? - ; — :.-. :: -:I ^ - i~- -.; :/.I - :- - -- ? determination 1 equina a good deal of atlcntktt in -. . . . next article. ? .die table of the next article. - -;?-?- ? .-- ? ? -? : :- ? I : -_-., - -: :;-^ -_ :L- - ? ? ? . - : .^_1- :-. tingmshing k from finseeed oQ, since the constants for fish oilclosely approximate those of fiaaecd oiL Fish oil should be ab- 7 - ?? :..-::: ?-.!.-?.- -- - --: - ::-:;- :r :-r :•: ill z ;-- :~ Best a little of tie oil nearly to ItT C. aad rub in on tie bade of ; rtion of color reveals the presence of rosin o€L ?rat riisrfe adulteration of - - - Warm 1 ie oil and add aa equal - - . ---:- - Chapter XIV 233 add one drop of concentrated sulphuric acid: pure linseed oil gives a seagreen color, but when adulterated with rosin oil a violet color shows it-self temporarily. 16. The Constants of Some Oils. The following table of constants serve to distinguish the variouscommercial oils. In cases where these constants do not differen-tiate, it becomes necessary to employ other tests, partially men-tioned in Art. 15: Name of Oil Gravity at Maumene Spec. Temp. Iodine 15° C. Number Reaction Number Linseed oil (raw) 103-130° 313-350 170-200 Linseed oil (boiled) ...
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