There are many materials used for mounting slides. Among these are tape and
glass, metal and glass, and plastic and glass.
However, glassless mounts
are the most commonly used and often present fewer problems.
b. Most Popular Mounts.
Mounts made of plastic or cardboard are the
most popular method of mounting 35mm slides. These glassless mounts offer
advantages, such as lower cost, maximum adaptability to projection
equipment, no glass breakage, no Newton rings, and easier mounting.
The
principal disadvantage is the loss of some protection. The surfaces of the
film are susceptible to finger marks and abrasions when given rough handling
in storage boxes or trays, but total risk of surface damage is small.
Because the advantages outweigh the disadvantages, this has become the
primary way to mount slides.
Mounts of this type are supplied in several
forms. Some typical constructions are as follows:
(1) Insert type.
The mount is presealed on three sides when
manufactured. The transparency is cut to size and inserted into the slot on
the unsealed side of the mount, which is then sealed.
(2) Hinged type. Where the transparency is positioned in the center
of the open mount, the top or hinged flap is brought down over the
transparency, and the three sides are heat-sealed.
(3) Two-part.
Here the transparency is positioned on the bottom
part, a top is placed over the transparency, and sealed on all four sides.
c. Storage of Slides.
Mounted transparencies represent a large
investment in time and materials.
If there was justification to produce
them, they warrant protection.
When not in use, they should be stored in
sturdy boxes or trays designed for slide projectors.
PART C - MIXING AND CERTIFYING THE E6 PROCESS AND IDENTIFYING
PROCESS FAULTS
6.
Mixing E6 Chemistry.
One important requirement for mixing chemicals is to follow instructions
included in the chemical kits. Improperly mixed chemicals may cause color
imbalance and unsatisfactory dye formation.
Several factors should be
considered for the proper mixing of chemicals.
4-6
SS0514
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