Care and Maintenance of Fabrics
Class 11 · Home Science
4 ideas in Class 11 Home Science, explained in plain words, with games and quizzes to practise.
Stain Classification and Reagent Chemistry
Part of: Stain Removal, Washing Methods, and Cleansing Chemistry
Stains represent unwanted marks resulting from contact and absorption of foreign substances that resist normal washing. They are classified by chemical origin: vegetable stains (tea, coffee, fruits) are acidic and yield to mild alkalies; animal stains (raw egg, milk, meat gravies) are protein-based and require enzyme detergents in cold water; oil stains require grease solvents or absorbents; mineral stains (rust, ink) need mild acids followed by alkalies. Safe stain removal demands prompt treatment using mildest reagents first.
Why it matters. Understanding stain chemistry prevents irreversible setting of spots, protects delicate fibers from chemical damage, and preserves garment freshness.
Key words
- Stain
- : Unwanted discoloration on fabric caused by foreign matter resisting routine wash.
- Vegetable Stain
- : Acidic spot from tea, coffee, or fruits, treatable with mild alkaline agents.
- Protein Stain
- : Animal-origin mark like raw egg or milk that coagulates permanently in hot water.
- Grease Solvent
- : Chemical liquid such as spirit or acetone that dissolves oily residues.
Try it in two minutes
- Identify the stain by checking its color, odor, and texture.
- Soak fresh protein stains strictly in cold water to prevent heat setting.
- Apply talcum powder or Fuller's earth to absorb surface grease marks.
Try at home. Test whether cold water or hot water works faster to loosen a fresh droplet of milk on an old white cotton rag.
Principles of Laundering and Dirt Removal
Part of: Stain Removal, Washing Methods, and Cleansing Chemistry
Laundering separates dirt into loose dust and grease-bound grime held by perspiration and oils. Water penetrates fabrics through kinetic motion (pedesis), but requires surfactants (soaps or synthetic detergents) to lower surface tension, emulsify grease, and hold soils suspended to avoid graying from redeposition. Friction washing suits sturdy cottons, gentle kneading and squeezing protects fragile woollens and silks, and suction washers clean heavy bulky looped towels.
Why it matters. Mastering laundering mechanics preserves fabric tensile strength, prevents wool shrinkage, and avoids dingy redeposited soil build-up.
Key words
- Surfactant
- : Surface-active agent that reduces water surface tension to speed fabric wetting.
- Pedesis
- : Kinetic microscopic motion of water molecules aiding dirt detachment.
- Emulsification
- : Dispersion of oily grease into microscopic droplets suspended in soapy water.
- Dirt Redeposition
- : Resettling of dislodged grime back onto clean fibers, producing dull graying.
Try it in two minutes
- Separate light cottons from heavily soiled articles to prevent soil redeposition.
- Select gentle kneading and squeezing for wool and silk garments.
- Ensure adequate water volume to allow suspended soil particles to rinse away freely.
Try at home. Add a drop of cooking oil to clean water, then add a drop of liquid dish soap and shake to observe emulsification.
Finishing Treatments, Ironing, and Dry Cleaning
Part of: Fabric Finishing, Fibre Properties, and Garment Care
Finishing restores fabric aesthetics and durability after laundering. Ultramarine blue neutralizes yellowing on white cottons, while fluorescent optical brighteners absorb ultraviolet light and emit visible blue light to counter both yellowness and grayness. Stiffening agents provide firmness and gloss: wheat or rice starch suits cottons and linens, gum acacia imparts delicate crispness to silks and rayons, and borax boosts stiffness and moisture resistance. Ironing requires heat, moisture, and pressure, while dry cleaning in perchloroethylene cleans delicate textiles without swelling fibers.
Why it matters. Mastering finishing techniques restores garment crispness, simplifies subsequent washing as dirt clings to starch, and prevents fiber distortion.
Key words
- Optical Brightener
- : Fluorescent dye absorbing ultraviolet light and emitting visible blue glow.
- Gum Acacia
- : Natural acacia gum providing delicate crispness to silks and sheer cottons.
- Dry Cleaning
- : Laundering fabrics in non-aqueous chemical solvents that avoid fiber swelling.
- Pressing
- : Applying static iron pressure vertically on targeted areas without dragging.
Try it in two minutes
- Dissolve blueing powder thoroughly to prevent patchy streaks on wet clothes.
- Match stiffening agents to fiber type: starch for cotton, gum acacia for silk.
- Ensure fabrics are evenly damp before pressing to achieve smooth creases.
Try at home. Prepare a small bowl of cooked arrowroot starch and apply it to a cotton handkerchief, noting its crispness after drying and pressing.
Fibre-Specific Maintenance, Storage, and Care Labels
Part of: Fabric Finishing, Fibre Properties, and Garment Care
Fabric care depends on inherent fiber properties, yarn twist, and weave construction. Cottons withstand vigorous friction, high heat, and alkalies, but mildew in dampness. Wool weakens when wet, felts under agitation, and requires moth protection (naphthalene balls) and flat drying. Silks demand mild detergents, low ironing heat, and shade drying. Rayon loses strength when wet and wrinkles easily, while synthetics (nylon, polyester, acrylic) dry rapidly but melt near heat and retain oil. Standard care labels provide clear instructions for washing temperature, bleaching, drying, and ironing.
Why it matters. Aligning fabric maintenance with specific fiber characteristics prevents shrinkage, fiber scorch, color running, and seasonal pest destruction.
Key words
- Care Label
- : Permanent tag providing regular instructions for washing, drying, and ironing.
- Felting
- : Irreversible shrinkage and interlocking of wool scales under heat and agitation.
- Silverfish
- : Wingless insect pest that damages starched cottons and rayons in storage.
- Line Dry
- : Hanging wet laundry from outdoor lines to dry in moving air.
Try it in two minutes
- Inspect sewn-in garment care labels to check temperature and ironing limits.
- Store woollens clean, completely dry, and wrapped with naphthalene balls.
- Iron synthetic fabrics at low temperature to prevent fiber melting.
Try at home. Examine the care labels on three garments at home and decode their washing, bleaching, and ironing symbols.
What your child will practise
- Fibre-Specific Maintenance, Storage, and Care Labels: Candy Quick Fire (Quick Fire)
- Finishing Treatments, Ironing, and Dry Cleaning: Desert Puzzle (Clue Puzzle)
- Finishing Treatments, Ironing, and Dry Cleaning: Desert Quick Fire (Quick Fire)
- Principles of Laundering and Dirt Removal: Space Quick Fire (Quick Fire)
- Stain Classification and Reagent Chemistry: Ocean Puzzle (Clue Puzzle)
- Quiz: Fibre-Specific Maintenance, Storage, and Care Labels (8 questions)
- Quiz: Finishing Treatments, Ironing, and Dry Cleaning (8 questions)
- Quiz: Principles of Laundering and Dirt Removal (8 questions)
- Quiz: Stain Classification and Reagent Chemistry (8 questions)