Polaroid type 55

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Polaroid Type 55 film is a black and white peel-apart Polaroid film that yields both a positive and a negative (which can be used in an enlarger). Though box-rated at 50 ISO, the positive and negative parts of the film are effectively rated at 50 and 35, respectively. When processed and peeled apart, the positive needs a protective coating to keep it from fading and the negative needs to be cleared in a hypo-removing solution (Kodak's Hypo-Clear works). Some photographers prefer to put the negative in a hardening fixer, though not all feel it necessary. Type 55 negatives are fine grained and have a long tonal range. They are useful for making large prints and for contact printing, especially in alternative processes such as Cyanotype and Van dyke brown.