The Stark County Democrat. [volume] (Canton, Ohio) 1833-1912, 1895-11-14
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BORDEAUX MIXTURE.
New Method OF Preparing It Described at
q Meeting Of Scientists.


New Method of Preparing II Described at
Meeting OF scieDtlsts.
At tho recent meeting Of the Associa-
tion of Agricultural Scientists Mr.. Swim.
gle of the department Of agriculture de-
scribed n4v method Of preparing bor-
deaux, summary Of which is given by
Rural New Yorker as follows:
Where bordeaux mixture is used on
an extensive scale it pays to prepare
stock solutions of both the copper sui
phate and the lime. The stock solution
Of copper sulphate is prepared by dis
solving in barrel holding 30 gallons
of water, 100 pounds of the bluestone.
The latter is dissolved by suspending it
in a sack just beneath the surface Of the
liquid. The usual plan is to put into
the barrel so gallons of water and then
mark the point where the liquid stands.
About one-third Of tho water is then
poured out and the 90 pounds of copper
sulphate, which has been previously tied
in coarse gunny sack, is suspended
over the odgo Of the barrel aud allowed
to reach just beneath the surface of the
liquid
When all the copper sulphate is dis
solved, the empty bug is taken out, and
a sufficient quantity Of pure water is
added to bring the solution in the bar
rel up to so gallon mark again. It will
be seen that every gallon Of the liquid
contains about two pounds of copper sui
phate in ISOLATION. This stock solution is
set away in "A convenient place, and
when wanted is drawn from the barrel
through wooden spigot ut the bottom.
The stock lime preparation is made in
much the same way. Fifty pounds of
lime are placed in a barrel and then
slaked in the usual fashion. When
slaked, sufficient water is added to bring
the whole mass up to Il previously de-
termined 90 gallon mark.
The stock lime is also stored in some
convenient place, but it is best to ar
range to remove what is wanted from
the top of the barrel rather than attempt
to draw it off through "a spigot.
To prepare bordeaux mixture it is
necessary to take a certain number Of
gallons Of the copper sulphate solution
and certain DumbeT of the lime solu-
tion and mix them in some suitable
vessel Mr.. Swingle find that the more
concentrated the two preparations are
when poured together the less satisfac-
tory will be the resulting mixture. Bor-
deauX mixture, when made from such
concentrated preparations, is likely to
be fiaky and granular and will very
soon settle He recommends therefore
that in making the mixture both the
lime and the copper sulphate solution
should be greatly diluted before bring
ing them together. Mr. Swingle would
prepare what we ordinarily call the 90
gallon bordeaux mixture as follows Di-
Lutte three gallons of the stock solution
of copper sulphate with water to 20 or
% gallons. In another vessel pour two
gallons of the stock lime preparation
and dilute this with about 10 gallons of
water. Pour the copper sulphate solu-
tion and the lime preparation slowly to-
gether, and then stir thoroughly for two
or three minutes with long handled,
broad bladed wooden paddle 1t will be
seen that this mixture contains six
pounds of copper sulphate and four
pounds of lime
Mr.. Swingle suggests simple meth
cd, which, if used when the first barrel
Of bordeaux mixture is made up, would
answer until the stock copper sulphate
solution and the stock lime are exhaust
ed. Of course when new supply of the
stock preparations is made mp it will be
necessary again to test the first barrel Of
the mixture. All that is required to
make the test is an ordinary penlznife
and piece Of emery paper. The knife
blade is inserted for couple of minutes
in the mixture, and if there is any free
copper present it will show as thin
film on the steel blade of the knife. II
there is no free copper present, the knife
blade will not be tarnished. II the knife
blade shows the presence of copper, it is
only necessary to add small quantity
of lime. Tho emery paper is used sim
ply to remove the copper film from the
knife blade Half minutes polishing
with the paper will put the blade in
condition for another test.