User manual

NO. 2 FLEXO ~ IA N AL.
33
This def ec t would be caused by a mista ke in r emovin g film
from devel
ope r too soon , by using so lution to o cold or by an
error in
co mpounding chemicals. It is obviou s that neither of
th
ese defects will occ ur in Ta nk Deve lo pm e nt if instruc ti ons
are prop erly followed.
INTENSIFICA TION BY RE -DEVELOPMENT.
Th ere are a numb er of different pr ocesses for intensi fy in g
tinder-devel
ope d n ega tives, the mo st commo n be ing by m ea ns
of Bichlo
ri de of 1\1 rcury and Sod iu m Sulphi te or Ammon ia.
This meth od , th ough simp le to u se , h as its disadvantages, as
it builds up the hi gh lights o ut of proportion to the w ea ker
po rtions of the n ega ti ve, a nd al so , unless ca refully h and l ed is
ap t to produ ce iridesce nt stains, or granular markin gs t ha t are
impo ssible to rem ove .
While the meth
od of intens ifi cation by re-develo pm e nt is
on ly co mp aratively ne w, the n ow co mm on u se of Velox and
R
oya l Re-develop r for Sepia tones on Vel ox a nd Bromide
prints wi ll make this the most effective means of intensifira ti on.
Vt:lox or
Ro yal Re·devel ope r may be u se d in exac tly th e
sa me manner as for produci ng Sepia tones on develop in g pape r.
Negatives int ens ifi ed by re-devel opme nt are built up eve nly
witho
ut undue cont rast and without t he chan ce of staining.
Th e adva nt age of be in g ab le to u se t he chemica ls fo r two
differe
nt purp os s (Sep ia toning prints or intensifying n ega ti ves)
is
obvio us, the r es ult in either case bing a ll that co uld be
desir ed.