The San Francisco call., 1910-11-06

simplest thing in the world find out For colorlns
the double dyeing process is the simplest MIX
two tablespoonfuls of the sample in halt a pint OF
water, heating the mixture if necessary.
Jams jelles catsup, confectionery, dessert powders
and anything of solid or semisoEd nature may be
subjected to this test Add the snixture drop OF
hydrochloric acid; boil, piece OF white wooden
cloth about four inches square in and water and
rinse thoroughly, that all trace OF wool OIL may
be eliminated
Tear off square inch of this prepared cloth and
place it aside for future reference Boil the larger
piece in the sample forsfve or minutes until
it is strongly colored Then take it out and wash it
in cold water. Eliminate much color as possible
from the cloth by boiling it in half cupfu of
which a spoonful of ammonia has been added.
Remove the cloth and throw it away Add slight
of hydrochloric acid to the ammonia solution,
which may be determned by the fact that blue ltmus
paper will turn red when immersed in it. To this
mixture add the second and smaller piece of cloth
and boil it.
If the dye is of vegetable origin the small piece of
cloth will be practically uncoored If the dye is ami
line or is coal tar product of any kind the small
cloth will have color which not beNremoved by .
simply washing.
FRUITS AND JAMS
The natural colors of preserved fruits and jams
and the like not leave any marked effect upon
a
which scarcely survives the washing process. 1t was
possible from many samples of soda water syrups and
such fluids obtain colors gay enough for east side
ball dresses
Many of the orange and lemon extracts contain
coal tar dyes. which readily detected while the
presence of turnerc in these extracts is determined
by simple chemical in which borax and hydro
chloric acid employed Caramel is burnt sugar
solution which is frequently used arti6cialy color
vinegar, distilled liquors and favorng extracts, and
thus mask inferior quality. Place a teaspoonfuI
of the suspected liquor in small round vial and add
twice much amyl alcohol If there is caramel
present the liquid will be nearly decolorized as the
caramel is thrown of solution and sinks to the
bottom of the vessel
The test for the presence of added water in milk !,
very simple and very good lactometer can be OBJ
tanned for less than dollar. Professor Allyn saws
very satisfactory instrument may be obtained for so
cents. Place a lactometer in milk the Temperatures
of which should not vary much from 90 degrees
Fahrenheit. Directions accompany the instrument
If the yellow color of milk has been attained bv
aniline dye the test is quickly applied which will de-
tect it.
The vegetable annatto coloring which is the most
frequently used in dairy products, is detected bv
shaking up teaspoonful of milk with twice thar
amount of ether When the liquids have separated
pour off the upper layer into teacup which is placed
in hot water until the liquid has evaporated Ada
paper The handbook specifies that the fat will re-
main residue and that the annatto will co1ect +;
the pores of the paper and impart to the fabric de-
cided orange tone.
One of the most dangerous preservatives emploved
for keeping milk is formaldehyde The housewife i
directed to place four tablespoonfuls of the milk CON
corning which she has doubts in teacup and to add
thereto the same amount Of hydrochloric acid and
drop of ferric chloride Five minutes later if the mill
be pure it will be uncolored while if it has been pre
served by the dangerous formaldehyde it will be law
ender or purple in hue.
If borax be present in milk it will mpart red or
orange color to teaspoonfu of the fluid (which ba,
previously been treated in aiear glass dish with one
drop OF hydrochloric acid and FIVE drops of ncture Of
turmeric
Soap which contains free alkah should not be used
for although it will wash clothes it will at the sans
time eat into their bers- To be sure that SOAP will
not-be harmful shave off into powder half tea
spoonful and place it in a FIVE ounce bottle To this
add four teaspoonfuls of strong alcohol and warm
the mixture gently by immersing the container in
water shaking the bottle several times Filter
the mixture and add to the fltrate two drons of
phenolphthaein solution. If pink color appears free
alkal is and the soap should not be used for
hns laundry purposes.