Subject

Recycling

Recycling is the practice of returning materials to use instead of discarding them, by repairing, reusing, salvaging or reprocessing what you already have.

For a household away from ready supply it isn't an environmental gesture, it's a stock of material that arrives free and would otherwise be thrown away.

Waste is a modern idea

For most of history there was almost no such thing. Metal went back to the smith, cloth was remade and then became rag and then paper, bone became glue and fertiliser, ash became lye and then soap, and food waste went through an animal before it went anywhere else. Materials cost effort to obtain, so nothing that had already been obtained was let go.

That changed when materials became cheaper than the labour to recover them, and the habit went with it. What's left is a household stream of genuinely useful material, sorted and delivered to the door, being treated as a problem.

The framing worth recovering is that materials are a stock rather than a flow. Something that arrives in your house is now yours, in a form that took energy to make, and the question is what it becomes next and not where it goes.

The order that actually saves most

There's a hierarchy, and reprocessing sits near the bottom of it despite getting all the attention.

Not needing the thing is first, and it's the only step that saves everything. Then using something you already have. Then repairing what's broken, which preserves all the work already in an object. Then reusing it for a different purpose, which preserves most of it. Then reprocessing the material, which recovers the substance and destroys the form. Then recovering energy by burning. Then disposal.

Each step down loses more of what went into the thing. A repaired chair keeps the timber, the joinery and the finishing; a chair broken up for firewood keeps only the fuel value.

Which means the highest-value skill in this whole subject is repair, and it's why the crafts elsewhere in this library matter here. A person who can sew, sharpen, solder, glue, splice and fabricate recovers things that otherwise go into the bottom of the hierarchy.

Salvage, and knowing what is worth taking

Demolition, farm clearances, roadside discards and old machinery are the richest material sources most households have access to.

The judgement is what's worth the effort. Fasteners, bearings, shafts, springs, bar and sheet stock, timber, glazing, hardware and motors are all worth taking because they're the right sort of thing already. Complex assemblies whose parts can't be identified frequently aren't.

Store it usefully or it becomes a different problem. Salvage that's sorted, labelled and accessible is a resource; the same salvage in a heap is clutter that gets stepped over for years and eventually thrown out anyway. Sorting on the way in is what makes the difference.

Be honest about the limit. Every workshop has a threshold beyond which more material makes it harder to work, not easier, and knowing yours is part of the skill.

⚠ Older materials carry hazards worth knowing about: lead paint, asbestos in older building products, treated timber, and the residues in containers that held chemicals. Identify before cutting, sanding or burning anything of unknown origin.

Metal, which is the most recoverable

Metal is the best recycling material there is, because it can be remelted indefinitely without losing its properties.

Sorting matters, and it's learnable. A magnet separates ferrous from non-ferrous immediately. Weight, colour, sound and how the material behaves under a file distinguish the common non-ferrous metals. Mixed alloys are worth far less and are harder to use, so separating on the way in is the whole game.

For a workshop the direct route is better than melting. Scrap steel is stock: leaf spring, old files and worn tools are frequently better steel than you'd buy, structural offcuts and reinforcing bar are usable directly, and sheet is sheet. The catch is that you often don't know the exact composition, which matters for hardening, so test a small piece.

Melting non-ferrous metals is genuinely achievable at small scale. Aluminium and the copper alloys melt at temperatures a simple furnace reaches, and casting from scrap into sand moulds is a well-documented craft. Iron and steel need considerably more heat.

⚠ Never melt or heat coated, galvanised or unknown metal. Zinc coatings produce fumes that cause a serious illness, and containers that held unknown substances can produce far worse.

Timber, glass and textiles

Each has its own logic, and in each case the higher-value route is reuse instead of reprocessing.

Reclaimed timber is frequently better than new: older, slower grown, denser and already seasoned. The work is in removing fasteners, and the discipline is checking for embedded metal before it meets a blade, because a nail destroys tools and throws fragments. Watch for treated and painted timber, which shouldn't be burned or worked without knowing what's in it.

Glass reuse as containers is the highest-value route by a wide margin, because it preserves the form. Beyond that, broken glass as cullet melts at a lower temperature than raw batch, which is what makes small-scale glass work feasible at all, and mixing incompatible glass types produces pieces that crack as they cool.

Textiles have the longest tradition. Garment to repaired garment, to remade garment, to smaller items, to patchwork and quilting, to rags for cleaning, to stuffing and to paper. Natural fibres compost at the end of that; synthetics don't, which is a real difference worth knowing when buying.

Plastics are the awkward case. They're the least recoverable at household scale, they degrade with each cycle, the types don't mix, and some release harmful fumes when heated. Reuse of the object is nearly always better than any attempt to reprocess the material.

The organic fraction

Anything that was recently alive belongs in a loop and not in a bin, and it's the easiest fraction to deal with well.

Composting is the default and it works on kitchen waste, garden material, paper, cardboard, natural textiles and, with more care, manure. It needs a mix of green material and brown, enough moisture to be damp, and enough air to stay aerobic. Hot composting is faster and kills more weed seed and pathogen; cold composting needs no effort and takes longer.

Animals are the more efficient route where they exist. Food scraps through poultry or pigs become eggs and meat first, and then manure, and then compost. That's the traditional arrangement and it extracts value at each step.

Wood ash is a resource, not waste: it holds potassium and raises soil pH, and it's the traditional basis of lye and therefore soap. It's alkaline enough to need using with judgement in place of spreading freely.

What stays out is the material that carries a hazard through the process: diseased plant material in a cold heap, meat and dairy in an open system that attracts vermin, and anything treated with something that survives composting.

Where this connects

  • Metalwork

    Scrap steel is workshop stock, and the sorting and testing decide what it can be made into.

  • Tool Making & Maintenance

    Repair is the highest-value step in the hierarchy, and it depends on being able to mend and re-edge things.

  • Food & Agriculture Systems

    Composting closes the fertility loop, which is the same balance sheet seen from the growing side.

  • Glass Manufacturing

    Cullet melts far below raw batch, which is what makes small-scale glass work achievable at all.

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Questions

What is the most valuable thing to recycle?
Your own labour, by repairing instead of reprocessing. A repaired object keeps all the material and all the work already in it, where reprocessing recovers the substance and destroys the form. Of the materials themselves, metal is the best, because it can be remelted indefinitely without losing its properties.
Is it worth melting metal at home?
Aluminium and copper alloys, yes: they melt at temperatures a simple furnace reaches and casting into sand moulds is a well-documented craft. Iron and steel need considerably more heat and are usually better used directly as stock than melted. Never heat coated, galvanised or unknown metal: zinc fumes cause a serious illness and unknown residues can be worse.
Can I use reclaimed timber for structural work?
Frequently, and it's often better than new, being older, denser and already seasoned. The work is removing fasteners and checking carefully for embedded metal before it meets a blade. Avoid anything treated or painted with unknown products, particularly for burning or for anything that touches food, and inspect for rot and insect damage, not assuming.
What should not go in a compost heap?
Meat and dairy in an open system, because they attract vermin; diseased plant material in a cold heap that won't get hot enough to kill the pathogen; and anything treated with a product that survives composting. Human waste is a separate subject with its own rules and doesn't belong in a garden heap. Everything else that was recently alive is fair game.
More questions, and every other subject, in the FAQ.

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