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Primitive Technology: Purifying Clay By Sedimentation and Making Pots

Nov 04, 2022

Primitive Technology: Purifying Clay By Sedimentation and Making Pots

Raw

clay

Clay

is full of rocks and other impurities that can burn or explode in the kiln Dig a pond to collect the

clay

Compact the soil so it does not contaminate the

clay

Dig up raw

clay

, including rocks and roots Dump

clay

on top of the pit Dig a pit in the

clay

heap Add water Mix the water to make it muddy (

clay

particles are suspended in the solution) Drain the

clay

ey water in the collection pit This was repeated several times, and the collection pit was backfilled to the lowered water level Note all remaining rocks in the upper pit Lower pit is allowed to settle Now free of rocks and other impurities Refined

clay

is removed from the pit to dry on the ground To obtain grog, old broken tiles were used Grog is finely ground down to ceramic.
primitive technology purifying clay by sedimentation and making pots
It is added to the

clay

to prevent it from cracking while it is being fired. The small pieces of ceramic prevent thermal shock in the ceramic as the temperature changes. Add grog to the

clay

and mix it. This will also help dry out the saturated

clay

.

Clay

ready for pottery Make round discs of

clay

to form the pottery. They do not have a central rotor to turn and are therefore not true potter's wheels. A layer of ash helps prevent the pot from sticking to the discs. When forming the base of the pot, keep in mind that the disc can be rotated instead of the potter moving,

making

shaping easier.
primitive technology purifying clay by sedimentation and making pots

Making

multiple

pots

simultaneously, layering some while the others dry is an efficient use of time. Coils are added to build the pot. Measurement is important to make sure they all fit in the oven. Shaping the

pots

into disks allows them to move (it was going to rain here). I found that it was faster to flatten the coils into long slabs to add to the pot instead of using round coils. Each layer should merge with the one below it, inside and outside the pot.

clay

hardened but still wet to give it a glossy, semi waterproof finish. Burnishing flattens the

clay

particles so that together they form a smooth surface (note the difference before and after) A shell can also be used to polish the

clay

. they are completely dry before firing.
primitive technology purifying clay by sedimentation and making pots
Wet

pots

burst and splinter in the oven from escaping steam. The dry

pots

are ready to be fired.

Making

a gate out of

clay

, as well as the pans. Scoring the

clay

to trap the heavier sand. This will make the shot more worthwhile, taking advantage of the space that would otherwise be empty. Put the

pots

on top of the bricks where they will be protected from sudden changes in temperature. The

pots

are upside down to trap the rising heat inside and bake more completely The damper then goes up Friction fire Push the burning fire into the kiln ash pit first and add wood here This slowly heats and further dries the pottery before proper cooking begins Covering ceramic with broken tiles to trap heat Now adding wood on top of grate for proper cooking Soon flames pass through top of kiln Wood is added over 1 hour and 30 minutes until the pottery on top glows red hot The next day, the cold kiln is opened A ringing sound when struck indicates that the pottery is well fired and structurally sound, a hollow sound indicates cracks Terracotta Xylophone The fired bricks Additional ones are always handy for later use Pile of bricks Water test for

pots

Pot survives water test and it will make a useful bucket for carrying water Gate test Gate works but grooves are a bit deep and trap coarser sand instead of the finer lodestone I look for for iron ore Next time I'll go shallower like I did with the first gate Processing

clay

is now much easier using the

sedimentation

method, resulting in a higher quality

clay

with less work Processed

clay

primitive technology purifying clay by sedimentation and making pots
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