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GLOSSARY

Baume' A measure of the sugar concentration in grape juice.

Bay
That part of a drying rack between two adjacent pairs of upright posts.

Bin dryer
A type of artificial dryer for finishing off partly dried fruit.

Bleaching
Removal of greenish chlorophyll tinge from dried sultanas by wetting and exposing them to the sun or artificial heat.

Blobs
Sultana berries that have not been fully covered by oil emulsion and so have dried slowly. They have a higher moisture content than the rest of the fruit at the shaking-down stage.

Bloom
The thin layer of wax that covers the skins of grapes and gives them a matt appearance when fresh and a bluish, powdery appearance when dried. It reduces the rate of water loss from the skins.

Brix
A measure of the concentration of a sugar solution. 1¡ Brix = 1% sugar by weight.

Bucket
Container made of metal or plastic used for transporting grapes from the vineyard to the drying rack.

Bucks
Currant berries larger than usual size that contain seeds.

Cap-stems
The small stem (pedicel) that often remains attached to a grape berry when it is removed from the bunch.

Caustic potash
Common name for potassium hydroxide (KOH), a chemical used in some oil emulsions.

Caustic soda
Common name for sodium hydroxide (NaOH), a chemical.

Clone
A group of individual plants grown from cuttings from a single ancestor.

Cold dip
An emulsion of potassium carbonate and oils used as a pre-treatment before drying Sultanas. Composed of 1.5% dipping oil and 2.4% K2C03 in water.

Crown
Arbitrary unit used to indicate the quality of dried fruit. For Sultanas grades range from 1 crown for the poorest quality to 7 crown for the highest quality fruit.Degree-day A measure of the total amount of heat energy available for plant growth. The product of the mean daily temperature in degC (degF) above 10degC (50degF) and the number of days.

De-seeding
The mechanical removal of seeds from raisins.

Dipping
Immersion of fresh grapes in an oil emulsion, which increases the rate of drying of the grapes.

Dipping emulsion
See oil emulsion.

Dipping oil A commercial preparation containing a mixture of ethyl esters of fatty acids and free oleic acid and used as a component of oil emulsions.

Dip tins
Metal containers with perforated bottoms and sides in which fresh grapes are held while being immersed in oil emulsion.

Dressing oil
Paraffin or vegetable oil applied to washed and cleaned dried fruit to prevent the individual berries from sticking to one another.

Drying green
The area surrounding drying racks - often grassed to reduce contamination of drying grapes with dust.

Drying rack
A rack with tiers of wire netting on which grapes are dried.

Emulsion
See oil emulsion.

Enzymes
Large protein molecules which control chemical reactions in the cells of living organisms.

Eranol
Commercial formulation of ethyl formate.

Ethyl formate
Chemical used as a short-lived insecticide in packed dried fruit.

Finishing off
The final drying process for grapes before they are put in a sweat-box. During finishing off the moisture content of the grapes is reduced from 18-20% to 13-14%, either by sun drying on the ground or in a rack or bin dehydrator.

Fogging
Application of pyrethrum (as a fog) in packing houses to control insects.

Green tinge
Greenish colour in dried fruit due to the retention of chlorophyll.

Gritometer
A gadget used to measure the amount of grit in dried fruit.

Grit
Sand and soil particles in dried fruit which make the fruit objectionably gritty to eat.

Harvest pruning
The severing of fruiting canes on grape-vines at the time of fruit maturity so that the grapes may be dried on the trellis (see also trellis drying).

Hessians
Sheets of loosely woven fabric of jute of synthetic material used to catch loose berries on the bottom tier of a drying rack. Also used for finishing off on the ground.

Hydrometer
A calibrated glass float used to measure the sugar content in grape juice.

Hydrophobic
Water-repellent.

Methyl bromide
A fumigant chemical used as an insecticide in stacks of dried fruit in boxes in packing sheds.

Micron
One-millionth part of a metre.

Moisture content (wet basis)
% moisture content = weight of water in sample x lOO/total weight of sample .

Moisture meter
Instrument used to measure the water content of dried fruit.

Naturals
Sultana grapes dried in the sun without prior treatment with oil emulsion.

Obst dip
Specialised equipment used for applying oil emulsion to grapes before drying.

Oil emulsion
A mixture of dipping oil, potassium carbonate, and water applied to fresh grapes toincrease their rate of drying. Standard strength oil emulsion is 1.5% dipping oil and 2.4%K2C03 in water, but other strengths are used in special circumstances (see text).

Potash
Commonly used for the chemical potassium carbonate (K2C03), a component of oil emulsions.

Processing
The grading, cleaning, washing and packing of dried fruit at a packing shed.

Rack
See drying rack.

Rack dehydrator
A drying rack that has been converted into a dehydrator by enveloping it inplastic sheeting and supplying a source of heated air.

Rack shaker
An implement attached to a tractor that shakes dried fruit from a rack onto trays orhessians suitably placed beneath it.

Raisins
In Australia dried Muscat Gordo Blanco and Waltham Cross grapes; in CaliforniaThompson Seedless (Sultana) grapes dried in the sun as naturals.

Refractometer
An optical instrument used to determine the concentration of sugar in grape juice.

Riffle washer
A machine used in packing sheds to remove grit from dried fruit by washing.

Shaking down
The removal of dried fruit from a drying rack by mechanically shaking the rack.

Side curtains
Hessians hung down the sides of drying racks during the drying of Currants or during sulphuring.

SIRO Gritometer
See Gritometer.

Sisalcraft
Commercial product consisting of sisal fibre sandwiched between two laminatedbituminized papers. Used to prevent ground moisture from entering dried fruit duringfinishing off on the ground.

Standard cold dip
See oil emulsion

Sulphuring
The burning of sulphur in trays under a drying rack to produce sulphur dioxide to prevent mould growth on drying fruit during humid weather.

Summer pruning
See trellis drying.

Sweat box
Wooden container measuring 94 cm x 64 cm x 20 cm used for storing and transportingdried fruit before processing.

Tier
Part of a drying rack made of wire mesh on which fresh grapes are spread for drying.

Trellis
An arrangement of vertical posts and horizontal wires on which vines are trained.

Trellis drying
The drying of grapes on the trellis wire after harvest pruning and spraying with oil.

Vinegar fly
Common name in grape-growing districts for the insect Drosophila melanogaster.

Wand
A forked-spray applicator made of light pipe used for applying oil emulsion to grapes on thetiers of a drying rack.

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