Republican news item. [volume] (Laport, Pa.) 1896-19??, 1899-09-14
Modern Way of Making Bordeaux Mix.

NJ Odern Way of Making Bordeaux Mix.
ture.
For two or three seasons the expert
ment station OF Cornell university has
been trying to discover the best
method OF making bordeaux mixture.
In Bulletin 156, this station gives di.
rections which are simple and very
efficacious: Into a barrel of water
suspend gunny sack or other porous
bag, containing two pounds of copper
sulphate (blue vitrioD for every gallon
of water in the barrel. If this is sus.
pended near the surface of the water
at night it will be in solution by morn.
ing and ready for use. Into water.
tight box or other oren receptacle
place some freshly burned caustic
lime, the amount to be determined
somewhat by the amount of spraying
to be done, but from forty to fifty
pounds of lime can be slaked at one
time. Add sufficient water to thor
oughly slake all the lime and keep
we'll stirred SO that the water may
come in contact with all particles.
This thorough stirring is important.
After the lime is all slaked, cover
with water and it is then ready for
use and may be kept for any length Of
time desired if it j. always kept COW
cred with water. Ferrocynide of potas-
SUM may be purchased from the drug
store, and comes as solid. One
ounce of this dissolved in one ounce
of water will be sufficient for testing
many barrels of the bordeaux mixture.
When it is desired to begin spraying,
there should be provided two empty
barrels. Into one barrel dip three
gallons of the copper sulphate solu-
ton after it has beeu thoroughly
stirred. This will provide the six
pounds of copper sulphate in case two
pounds were dissolved per gallon Of
water and will be sufficient for making
one barrel or forty-fve gallons bor-
deaux mixture Dilute the three gal
Ions with ten or more gallons of
water.
From the lime box dip from five to
ten pounds slaked lime into the empty
barrel. Add water and stir thoroughly
until the milk of lime is pro-
duced, after which dilute with some
ten gallons NOR of water. Pour the
milk of lime thus diluted through a
sieve into the dilute copper sulphate
solution. The quantity of lime to be
added to the copper sulphate is to be
determined by the ferrocynide of po-
tassium test. After adding small
amount of the milk of lime to the cop
per sulphate solution, add to the mix
ture drop of ferrocynide of potas-
stun. If n brick red color is produced
where the drop strikes, it indicates
that more lime is needed. Continue
adding the milk of lime until no red
dish color will be produced when the
ferrocynide of potassium is used. A
few trials will enable one to judge
very accurately as to the amount of
lime required. A little surplus lime
will do no harm.
If paris green is to be used it should
now be added. Take four ounces OF
paris green and place it in dish and
add water just sufficient to make a
paste, stir thoroughly until homo
geneous mixture is formed. Pour this
paste into the mixture of lime and
copper sulphate and stir vigorously.
Pour the lime and copper sulphate
mixture into the spray barrel, which
should have capacity Of forty-f to
fifty gallons, and fill the barrel with
water. Ii there is no agitator in con-
nection with the pump, the mixture
should be frequently stirred while be-
ing applied.