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Filter Paper: Soft, Unsized Paper from Linen Rags
Charlie

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Charlie

14. uMfumfu 2026DE
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Filter Paper: Soft, Unsized Paper from Linen Rags

Filter paper is paper left soft and porous: made like ordinary rag paper but never sized, so liquid runs through it and solids stay on top. Pharmacists once used such a paper, charta emporetica, for filtering.
Oqalayo
Two days

Imiyalelo

1

Watch: making linen paper by hand

Old linen made into sheets with a mould and deckle.
2

Cut and cook the rags

Cut clean linen rags into small pieces. Make a lye by soaking wood ash in water and pouring off the clear liquid, then simmer the rags in it for a few hours to soften them. Rinse well.

Izinto zokwakha zalesi sinyathelo:

Amanikiniki e-linenAmanikiniki e-linen1 kg
Umlotha Wokhuni OluqinileUmlotha Wokhuni Oluqinile1 as required
AmanziAmanzi1 as required

Amathuluzi adingekayo:

IsikeloIsikelo
IbhakedeIbhakede
Ibhodwe elikhuluIbhodwe elikhulu
3

Beat to pulp

Beat the rags with a mallet, a handful at a time with a little water, until the fibres separate into pulp.

Amathuluzi adingekayo:

Isando SokhuniIsando Sokhuni
4

Form the sheets

Stir the pulp into a vat of water. Dip the mould and deckle, lift it level and let it drain.

Izinto zokwakha zalesi sinyathelo:

AmanziAmanzi1 as required

Amathuluzi adingekayo:

Umphongolo omkhulu wokhuniUmphongolo omkhulu wokhuni
Isikhunta nesivalo somenzi wephephaIsikhunta nesivalo somenzi wephepha
5

Couch, press and dry — no size

Turn each sheet onto a damp felt, stack felt and paper, press out the water and hang the sheets to dry. Do not size them: unsized paper stays porous, which is what lets it filter.

Amathuluzi adingekayo:

Ishidi lofelefele woboyaIshidi lofelefele woboya
Intambo yokomisaIntambo yokomisa
6

Cut and fold to use

Cut the sheets into circles, fold one in quarters and open it into a cone to sit in a funnel.

Amathuluzi adingekayo:

IsikeloIsikelo

Izinto

3

Amathuluzi Adingekayo

8

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