Nedfalds-lav

Nedfalds-lav er perfekt til naturfarvning, det gør nemlig ingen skade at samle det nedfaldne lav op – det kan alligevel ikke gro videre. Tue-grenlav er en af de almindelige arter, som også er let at genkende.

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Når jeg går tur på blæsende regnvejrsdage finder jeg tit masser af lav, der ligger spredt på jorden under træer. Lav, som vinden har flået af grenene. Efter en god storm har jeg nogle gange fyldt alle mine lommer plus tilfældige skraldeposer med sådan noget nedfalds-lav. Det skønneste nedfald, med den fantastiske duft som kun lav har.

Indsamling af nedfalds-lav gør ingen skade, for lav-totter, der er flået ned kan alligevel ikke vokse videre. Så det er den bedste (nogle vil sige den eneste) måde at finde lav til farvning. Når jeg kommer hjem med sådan en skat plejer jeg at sprede lavet ud på en bakke til tørring (så det ikke bliver muggent).

Nedfalds-lav tørrer. Det ser ud til at være et stort stykke Evernia pruniastri til venstre, til højre Ramalina fastigiata for oven og formodentligt en art Parmelia for neden.

Før man kan farve med nedfaldslavet, er det nødvendigt at sortere det og bestemme arterne. Med nogle arter skal man nemlig bruge en simpel kogning i vand (BWM), mens andre skal trække i ammoniak:

Kogning i vand er selvfølgelig det letteste. Lavet simres i vand og køler af. Garn tilsættes til dette farvebad, og opvarmes en timestid uden at koge.

Ammoniakmetoden er noget mere besværlig. Lavet trækker i 1% ammoniak (oprindeligt brugte man gammel urin) i flere uger eller måneder. Glasset rystes og åbnes dagligt for at ilte væsken. Den røde væske bruges til sidst som farvebad.

I begge metoder er det unødvendigt at bejdse garnet, da lavets farver er substantive (de kan altså binde direkte til uldfiberen uden bejdsning).

Lav, der trækker i 1% ammoniak.

For at kunne artsbestemme lav købte jeg for nylig Frank S. Dobsons bog “Lichens, An Illustrated Guide to the British and Irish Species”. Den indeholder en god introduktion til lav, og en detaljeret bestemmelsesnøgle med beskrivelser og fotografier.

Med Dobson i hånden har jeg tænkt mig at kigge lidt nærere på de slags lav, der typisk falder ned fra træerne heromkring. Altså, hvordan man genkender dem, hvilken farvemetode der skal bruges, og hvilke farver det giver.

Jeg begynder her med den slags lav, der måske er allerlettest at genkende, og også meget almindelig: Ramalina fastigiata, eller tue-grenlav. Den falder tit ned i større totter, som er helt dækket af udvækster, der ligner små sugekopper. Det er apothecier, som er lavets frugtlegemer. De laver kønnede sporer, som kun indeholder lavets svampedel. Når de spreder sig og spirer et nyt sted skal de mødes med en ny alge for at blive til et nyt lav-individ. Men alt det behøver farveren strengt taget ikke at bekymre sig om, bare man kan genkende apothecierne.

Et stykke Ramalina fastigiata, som er helt dækket af apothecier. Sådan nogle totter kan være op til ca. 5 cm.

I “Lichen Dyes, The New Source Book”opfører Karen D. Casselman Ramalina-arterne på listen over laver, hvor man skal bruge ammoniakmetoden.

Jeg har tidligere afprøvet denne metode med Ramalina fastigiata, og fik en lys rosa farve (billeder her).

Men Ramalina-arterne står faktisk også på listen over de arter, hvor man kan bruge den simple varmtvandsmetode. Derfor afprøvede jeg den simple metode med lige mængder Ramalina fastigiata og garn, men det gav absolut ingen farve (ingen billeder!). Konklusionen er, at Ramalina fastigiata hører strengt til ammoniak-arterne.

Jars of Lichens

Lichen dyeing is a slow discipline – the slowness only surpassed by the pace that the lichens themselves grow at…

I started two jars of lichens late in February, one with Evernia prunastri (left) and one with Ramalina fastigiata – at least, I’m fairly sure that’s what it is (right).

lichens

It’s important to mention how I gathered these lichens: the Ramalina fastigiata is all windfall from a single tree that used to grow in the playground near our house. Every time I walked under it, I found at least one bit of fallen lichen, and often, I filled both pockets. But then, the other day, I walked by only to find that the tree had been cut down! Along with every other tree nearby!! I hope some city planners somewhere are hanging their heads in shame. That place is not fit for humans anymore. Or any other species for that matter.

Most of the Evernia prunastri is also windfall, but some was picked during trips to several different forest where it grows so thick that most trees are completely covered with it, and in that case, picking off small bits is OK.

Evernia prunastri, also known as oakmoss, ragged hoary lichen, and stag’s horn lichen, is a well known dye lichen, and is also a component of many perfumes (makes sense, its scent is wonderful, but that’s the case with all lichens I’ve met up close). I put 25 g of this in one jar.

Ramalina fastigiata is not specifically mentioned in the lichen chapter of “Vegetable Dyes” by Ethel M. Mairet, a remarkably useful book from 1916 that you can read for free at the Gutenberg project. Nor does “Lichen Dyes, The New Source Book” by Karen Diadick Casselman, but both books mention unspecified/other Ramalina species as sources of red/pink using the ammonia method (and Casselman also indicates that yellow can be obtained with boiling water method). I put 20 g of Ramalina fastigiata in a jar.

After adding lichen to a jar, it should be filled with 1% ammonia so it covers. I buy the ordinary kind at a supermarket. It is 8%, so I simply make a diltion to 1%.

And then comes the tedious part!

Let the lichens steep in ammonia for weeks and weeks, take the caps off every day to let in air, and shake the jars well and often to ensure aeration. Casselman warns again and again that the color will not develop properly without good aeration.

I was diligent in my vat-shaking until early April, at which point I decided to try out the dyes.

From each jar, I took the amount of liquid that is equivalent to 5 g of lichen. From the Ramalina jar, which had 2o g of lichen, that was 1/4 of the liquid or about 100 ml. From the Evernia jar that contained 25 g of lichen, 1/5 of the liquid.

I diluted them to cover the yarn and placed them in a double boiler system with glass jars inside a pot of water. I remember reading about this somewhere, but I don’t remember who the brilliant person is…

But it’s very clever for these small dye baths AND also very good because the pH is above 10 even after dilution, so you have to heat very gently to not damage the wool:

doubleboiler

I gently heated the pot for about an hour, then took out the skeins of wool instead of leaving them in the dye bath until next day as I usually do. I did it differently because I thought the high pH over so many hours would ruin the wool.

This first dyeing attempt gave a couple of skeins of medium pink shades that are quite pleasing, I think! The Evernia-dyed skein (on top) has a slightly browner tone of pink than the Ramalina-dyed one (bottom) which is truly baby pink

lichenwoolapril

After that, I let the jars continue until late June, but I’m afraid the vat-shaking was much less diligent!

But on June 21st, I decided to finish the experiment.

I filtered the rest of the liquid in each jar, then measured the pH, it was 10-11 (as expected). I split the dye liquid from each jar in two, left one of them as it was, and neutralized the other one. I used about 1 part 37% acetic acid to 5-8 parts dye. This is just what we happened to have in the house, HCl would work too. If you want to try this at home, wear goggles and lock children and pets in another room.

Then I used the same double boiler setup as first time, taking out the wool at high pH after an hour, and leaving the skeins in neutral jars until the next day. And the result:

lichenwooljune

From right to left, it’s:

1: The Evernia-dyed skein from April

2: The Ramalina-dyed ditto

3: Evernia high pH, June

4: Ramalina high pH, June

5: Evernia neutral pH, June

6: Ramalina neutral pH, June

So actually skeins 3 and 4 are just a repeat of 1 and 2 but a couple of months later. I’m really not sure why the color was better in April than in June. Because I stopped shaking the jars as much? Or does it influence the result that I used alun mordanted skeins in April but unmordanted wool in June? It shouldn’t, since lichen dyes are substantial, but one never knows.

The neutralized dye baths yielded more color, but the color is towards tan tones rather than a real pink. Nice colors, but I’ve gotten similar colors from avocado with less effort!

FACTS – LICHENS, AMMONIA METHOD

Mordant 10% alun on some skeins, none on the others (it’s what I had around)

Water Tap

Yarn Supersoft 575 m/100 g

Yarn:Dyestuff ratio 2:1 and similar ratios

Conclusion Lovely baby pink plus more saturated orange-pinks

Possible improvements I’d like to get more intense color with this method, and I imagine using more lichen could do the trick. But the shaking of the jars is probably just important to optimize!

 

All in all, I’m pleased with my first results using these types of lichens and the ammonia method. But I do think there is a lot of room for improvement. I’ll probably start some new jars soon!

Tilbage i februar startede jeg krukker med to slags lav, Evernia prunastri og Ramalina fastigiata i 1% ammoniak. Jeg har virkelig gjort mit bedste for at ryste dem og tage låget af lidt tid hver dag, for at der skulle komme rigeligt ilt til, så farverne kunne udvikle sig.

Det gjorde jeg i hvert fald til og med april, hvor jeg farvede de to første testnøgler, og fik fine pink farver. Fra april til juni glemte jeg nok lidt krukkerne… Så i juni besluttede jeg mig for at afslutte eksperimentet. Jeg neutraliserede halvdelen af farven med koncentreret eddikesyre, og det gav pink toner ovre i det orange.

Jeg tror bestemt ikke, det er sidste gang jeg forsøger mig med disse typer lav. Faktisk lader jeg aldrig lav ligge på jorden når jeg finder det på mine gåture, så jeg har et lager til at sætte de næste eksperimenter i gang snarest!

 

 

 

 

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