Salt makes a good trade good because every household needs it daily, it does not spoil if dry, and it packs dense, but a pound of salt made by boiling seawater carries roughly 20 to 41 pounds of wood in the fuel it took, which is much of what you are paying for. Before buying or selling, weigh it dry, test it for dirt, bitterness and dampness, and know where it came from, because damp salt is sold as weight and unknown salt may not be food at all.
Part of Salt Production & Sourcing
Salt as a trade commodity is its use as a store of value and a good exchanged between communities, tied to what it costs to make, move and test.
Why Salt Trades
The parent article says that a community that cannot make salt should treat a trade relationship with a coastal or salt-spring community as a survival priority, and that salt is one of the few resources worth long-distance trade expeditions. Several properties explain it: it is needed daily by people and stock, nothing substitutes for it, it keeps indefinitely if dry (Keeping salt dry), and it is easy to divide into standard weights. A forest community with timber and game but no salt and a coastal community with fish and salt but no grain or tools are natural partners (Inter-Community Trade).
The word “salary” is often said to come from salt, as the parent repeats. That derivation is widely repeated and disputed, so do not treat it as established history. The practical point stands without it: salt has been used as a currency, and the properties above are why (Trade & Currency, Barter Goods).
What A Pound Of Salt Is Worth
The value is in the making. From the yield article, salt boiled from seawater needs about 20 to 41 lbs of dry wood per pound (2,041 to 4,083 lbs per 100 lbs; Yield calculations); the parent’s own range was 3,000 to 4,000 lbs per 100 lbs, or 30 to 40 per pound. Salt from a saturated brine needs about one-thirteenth of the water evaporated that seawater does (Brine Boiling), and solar salt costs mainly labour and land. A producer’s costs therefore differ by a large factor, and a buyer who knows how a seller makes salt knows what the seller can afford to take. I cannot source an exchange rate between salt and grain or tools; it will be set by local scarcity and by negotiation, so record trades in a ledger (Resource Ledgers).
Check What You Are Buying
- Weigh it dry. Salt holds water, and a damp batch sells water by the pound. Dry a sample on a hot dry dish and weigh the loss.
- Test for dirt. The residue test in Purification & Grading works on bought salt as well.
- Taste for bitterness, and check for dampness overnight.
- Know the source. The tests cannot find poisons. Salt from a source you cannot identify may be industrial, road salt, or a curing mix.
- Agree the unit. Trade by weight on a scale both sides trust, not by the bag or the scoop.
What You Need
- A trusted scale and weights
- Sample dishes and filters for tests
- Containers that keep the salt dry in transit
- A ledger of what was given and received
Method: A Salt Trade
Step 1: Agree the unit (dry pounds or kilograms) and the grade.
Step 2: Take a sample from the middle of the load, test it, and weigh the whole load.
Step 3: Agree the exchange in the ledger.
Step 4: Move it dry, in sealed containers, and recheck on arrival.
Step 5: Store bought salt apart from your own graded stock until it has been tested.
Common Mistakes
- Buying by volume.
- Paying full price for damp salt.
- Trusting appearance alone.
- Putting trade salt straight into the food store.
Safety
Bought salt may not be food salt
Salt from outside the community can be road, de-icing or industrial salt with additives and contaminants, salt from polluted water, or a pink curing mix containing nitrite, which is toxic if used as table salt. Keep unknown salt out of food until you know what it is, and use it only for rough work if you are sure it is not harmful to animals.
What’s Next
- Learn next: Barter Systems — trading when there is no money
- Combine with: Storage & Distribution — keeping what you trade for