You can get 4 × 5 in. processing trays from a photographic dealer or from E-Bay, or you can use small plastic food containers from supermarkets. Later, you may need larger ones, but small ones are better to begin with, as they don’t use so much of the processing solutions. If you don’t already have a thermometer with a temperature range from 10°C to 50°C (50°F-130°F), the same dealer will be able to provide you with one. e scales can be of any kind that will measure down to 1 g. You can get excellent ones from stores with

BOX 6.1 ITEMS REQUIRED FOR YOUR FIRST HOLOGRAM* •Laser pointer, red or green, modied if necessary*, or HeNe laser with beam

expander* •Support for laser* •Piece of black card, to act as a shutter •Support for holographic plate and subject* •6 × 6 cm or 2.5 × 2.5 in. red-(green-) sensitive holographic plates (preferable

to lm at this stage) • Blu-tack or Plasticine •Black felt marker pen •Sink with running water •Firm bench at least 1 m long •Four 4 × 5 in. processing trays (at least one should be white) •Scales for weighing processing chemicals (if making up your own solutions) •ermometer •Minutes and seconds timer •Green (red) safelight-green for red-sensitive plate and red for green-

sensitive plate • Window-cleaning rubber squeegee (new!) or a at car windscreen wiper •Bottles for processing solutions •Distilled or deionized water •Surgical or latex examination gloves

*e starred items are discussed in the following text. You also need a subject for your holographic image, of course. Choose

something small, hard and white, or at least pale colored. Don’t pick anything oppy. A small statuette, a piece of jewelry, a key ring, a seashell, or a few nickel coins will do.