Evening star., 1949-05-15
Darkroom

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room NugkrF - negative IoS
symptoms arr Fat. sfay EpgseNg.
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ertsloYef IS Nugn oat oT has TX
cuAae contain mated SHh eihrF
chemicals II Epu are certain that
none @! these conditions exists ia~
spcet llsc darkroom Fot l1hi ieAKs
and I've sure that yeay sAfeslEht IA
really Safr ioT the tNfe II rim sfaa
are using A red sajetlsht - all
rlght for ogthochtomAtsc rim hai
Will toS panehromaiIe film Even
the flght type ssisltght Sigl ieg
alm u the hght Is too strong.
watch the Chemleals.
Negative stains are usually TIRE
result Of careless technlaurs To
prevent THIS occurrence yea should
be careful in the mixing cf yeaT
developer and he SURF that al
ingredients are thotoaEhlY els~
solved. Then keep the hypo traF
al q aafe distance 40 that there
Will he no chance for splashes 10
reach the developer In passing
the films from the developer 10 the
hypo take care 70 avoid carrying
hypo 10 the developer on yoor
hands The best procedure is 10
use the left hand 10 pass the rim
from the tank oT tray uf developer
10 the right hand for immersion
in the hypo. A little developer IN
the fixing bath won't do much
harm but q drop or two Of THE
hspo In the developer may be sust
enough 10 stain the flm Stains
are also caused by turning on ths
light before the negative has fixed
properly or from the negative
touching some contaminated suf"
face.
II you have observed all safety
rules you still wtll have another
hurdle 10 go. When the negative
is hung TO dry. water drops wtll
form and cause wAtermaIks in the
course OF drying To avoid this. be
alert 10 wipe the film under water
TO remove ell traces ni hCum then
aive the negative last rlnhe In .
water bath containing q victims
agent which may be purchased al
any photo store. II you have
washed the film thoroughly to re-"
move all traces Of chemicals ynu
should have no worries on that
score.
We have avoided DISCUSSING IN
this article the causes Of the
most Of amateur darkroom dt~
neul,ies overdevelopnent and
underdevelopment. We have done
NO because Il ia felt that the sub
iect deserves individual treatment
which IL will receive In sub
seauent article However. II should
be pointed out that all Of your
efforts directed At making q good
picture can be nuilifsd by an over
or under development af the MIN.
II the exposure was accurate ynd
will do well 10 check your solution
temperatures and develop accord.
ing 10 the recommended time set
forth by the maker Of the filn.