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Posted by alin23 6 days ago

Developing a food-safe finish for my wooden spoons(alinpanaitiu.com)
223 points | 146 commentspage 2
zkmon 2 days ago|
I always wondered whether the wooden spatulas and spoons they sell at IKEA are safe to use. I never know what that wood was treated with or coated with.
vages 2 days ago||
Perhaps I’m naive, but buying from an IKEA (in Norway) or another big store feels less risky than buying something handmade.

Several people are involved in making every product at IKEA. At least one of them must be an expert in compliance. They can expect scrutiny and product recalls, fines and bad sales if they’re found out.

The one person making the hand-made spoon does not necessarily know all the environmental regulations that should be followed.

xyzzy_plugh 2 days ago|||
I had a ceramic coffee mug that I loved and used very regularly. I bought it at a fair from a local potter and it had a very unique glaze, lots of blues and greens.

A friend who is a potter saw me drinking out of it and said that the glaze looked suspicious. He said it looked loaded with heavy metals, and that I should probably not use it or at least get it tested.

At the time I knew a guy who worked in a lab that tested certain substances for hazardous materials. He was intrigued and brought it in to work one day, and later texted me asking if I wanted it back, because it was very likely leaching cobalt, lead, and cadmium, and it was probably also very mildly radioactive.

I feel much better drinking out of mugs from IKEA and other big name stores.

bluGill 2 days ago|||
maybe. Or maybe they are just buying from China and trusting it to be good and not change formula once you accept the sample.
ricardobeat 2 days ago|||
They are raw wood, unfinished. I usually give them a little sanding and a layer of beeswax - doesn't last very long but makes them feel new for a while :)
hammock 2 days ago|||
Well unless you are getting solid wood utensils (much more $$ and most aren’t) then you are starting with bamboo glued together with adhesives. So at that point if you are worried about the finish I’d be worried about the glues as well

I get solid wood (olive wood or other woods ) tools and I don’t finish them. But if I did I might just use beeswax

ricardobeat 2 days ago|||
Cooking utensils are mostly one piece, otherwise wood glue is PVA, same as school glue, that's about as non-toxic as you can get. I'd be more concerned about some kind of supply-chain issue contaminating the raw wood - hopefully they do frequent control checks on the material.
hammock 2 days ago||
They aren’t one piece. See the dark seams? https://www.everythingkitchens.com/totally-bamboo-all-natura...

These are strips glued together aka laminated. The binder is not PVA (which is water soluble and not suitable for the task), it’s most commonly a formaldehyde resin such as phenol- , urea- or melamine urea formaldehyde

ricardobeat 1 day ago||
That’s plain bambu, the dark areas are the nodes/rings in the plant.

I don’t build cutting boards myself, but have never heard of using anything but food-safe PVA glue. Those resins are used for laminating plywood etc, probably not even legal to use in kitchen utensils, at least in the EU.

snowwrestler 1 day ago|||
Ikea sells solid wood spoons and spatulas starting at like $3.
mbrock 2 days ago||
I think all wood finishes are "food safe" once they're cured.
clickety_clack 2 days ago||
That is a terrible assumption to make. Regular lacquer for example does poorly under temperatures commonly encountered when preparing food and it’s basically a mix of solvents.
mbrock 2 days ago|||
The solvents evaporate when the lacquer cures, right? A lacquered spatula or spoon could leach some plasticizers when heated up. But who on earth would go to the trouble of spray lacquering a spatula? It doesn't seem like a real concern. Wooden spoons from IKEA aren't gonna poison you!
DannyBee 2 days ago|||
It's not a terrible assumption - it's a requirement to sell a wood finish in the US/Europe.

Under temperature, sure, they differ a bunch. But in terms of food prep, no, they are all non-toxic and edible once cured.

mbrock 2 days ago||
Flexner's "Understanding Wood Finishing" has a section about "the myth of food safety" that pretty directly states that food safety isn't a serious concern for fully cured finishes.
teekert 2 days ago||
I use wood only for my non-stick pans. Metal for the metal pans. I sometime put some olive oil on the utensils, but generally, I just use them, put them in the dishwasher, repeat, until they break. They are ~50 cents at Ikea. And so I don't eat any plastics anymore.

Of course, the article is about high end stuff, but I just want to put everything in the dishwasher. Which I presume you can't do with even the best coated high end utensils?

We also switched to wooden Cutting boards, I find them to be pretty annoying as they really go bad fast in the dishwasher and can be quite expensive. We just wash them with boiling water, a bit of soap every now and then.

tecoholic 2 days ago||
Seems a little extreme to pour boiling water on wooden cutting boards to clean? Do you live in really cold and snowy place without much access to sunlight hours? Just washing them with soap and drying them in sunlight is all we do and it’s been good. We also don’t cut meat on the wooden board. I would use hot water if it were meat on the board.
carlosjobim 2 days ago||
Never put a wooden cutting board in the dish washer.

Never use boiling water. Use warm water and a little bit of soap.

bgnn 2 days ago||
Great blog post. I like the emd look of the experimental finish.

Couple of years back I went to all wooden spoons in the kitchen. My all time favourite is the most traditional of all: boxwood. This is what wooden utensils are made in my home country for centuries. It's light but dense, hard, and durable. It doesn't absorb color or smells easily as other hardwood. Beautiful too!

sfink 1 day ago|
> It's light but dense,

What does that mean? It's tough enough that you can make it thinner? It dries out more fully? Or does "dense" refer to something other than density, like tightness of the grain?

bgnn 1 day ago||
It's indeed the tightness of the grain, but also volumetric density (975 kg/m³) is higher than oak or spruce. What I mean with light is, indeed you can make very thin utensils and they won't break, bemd etc so at the end the product is lighter than the obe made with a softer/less dense wood.

Boxwood was for centuries the choice of wind instrument makers because of its stability and hardness, which made it possible to create thinner more practical instruments (clarinets, flute etc). till humans discovered granadillo wood, which is as dense as boxwood but much more humidity and temperature stable.

Dumblydorr 2 days ago||
Incredible analysis, great blog post! What’s wrong with using raw wood? Will that go bad quickly?
coryrc 2 days ago||
If you use the appropriate wood, you can wet and sand many times to get a smooth finish. You can burnish it (rub with hard metal) to close the surface well. But it will still stain and absorb smells, just to a lessor extent. You'll notice if you use the same spoon for coffee and tea, or the same spoon for curry and miso soup.
Freak_NL 2 days ago||
Why would you use a wooden spoon for those? I use wooden utensils for frying and stirring in metal pots and pans. Everything else is just the usual stainless steel type suitable for utensils.
coryrc 2 days ago||
I don't know either, but the article is about wooden coffee cups.
convolvatron 2 days ago|||
I don't have a problem. if they get a little funky I just sand them down. and let them soak in food-grade mineral oil for a while. same with cutting boards and butcher block tables.
awestroke 2 days ago|||
When the wood fibers get wet they swell and become soft. When soft, the surface will be very sensitive to damage. Fibers on the surface will raise and then not return to their original position, causing surface roughness. Repeated cycles of wet/dry will cause cracks.
Saline9515 2 days ago|||
From experience, even the cheapest wood spoons won't bulge, as long as you don't leave them immerged in water for a long time.
mmooss 2 days ago||
Could that be because they are treated somehow?
Saline9515 1 day ago||
They were likely treated with mineral oil, but the finish has been gone for a long time now.
esperent 2 days ago||
Depending on the climate, it can go moldy very quickly.
esquivalience 2 days ago||
Alin (OP), what a wonderful article. I've had the same problem and had given up experimenting for similar reasons to you. I'm now thinking to finish the cup I've half carved and have sitting on the shelf in the shed. Thanks!

Your shop looks great too. Others might enjoy folowing the link buried towards the bottom of the article.

alin23 1 day ago|
Thank you for the kind words! Do try to finish your cup, it's a great experience both to drink from something made by your hands, and to drink from a wooden cup if it's finished well.

Make sure you do water popping after finishing the carving and sanding process. It's what makes the difference between wood that catches your lips and wood that feels like ceramic. The process is simple: sand with 600 or 400 grit, whichever you have, then get all the wood wet with water (faucet is fine), let dry completely (hairdryer helps), sand again with 600/400 grit and repeat about 3 times until wetting the wood no longer makes it feel rough.

esquivalience 1 day ago||
Great advice thanks, and a new technique to learn too. When making walking sticks I usually go to 1200 grit, or 2500 where finish is really important. Finishing is my favourite part of the job, similar to your point about epoxy (why would you want to interface with a layer of plastic?)
derbOac 2 days ago||
The timing of this is sort of uncanny as it's been on my mind a lot lately.

Generally I use a beeswax and mineral oil finish, sometimes this other product I can't remember the name of made from flax oil.

I've been wondering why jojoba oil doesn't get mentioned more in these discussions, either in combination with something else or on its own? It's a wax but liquid at room temperature, and seems to be stable for a long long time, long enough at least that it would probably need some refinishing before it might go bad.

alin23 1 day ago|
The problem with jojoba oil is that it doesn't polymerize or cure. It stays wet in the fibers. Nothing bad with that on wood that doesn't contact hot food and beverages.

But if you put wood treated with non-polymerized oil in a hot soup or if you pour hot tea into a cup finished with jojoba oil, the oil will get out of the fibers and into your hot liquid, the fiber will raise and the wood will start to feel rough after a few uses and start to get stained from your food and beverage.

moron4hire 2 days ago||
I make wooden cups. I use water-based polyurethane out of a spray can to waterproof the interiors. I find it a lot easier to use than epoxy in almost every aspect.

For the exterior and for cutting boards, I use a hard wax oil I make from linseed oil and beeswax. It's easy to prepare and I usually provide a small cup of it to whomever I'm gifting the cutting board.

I reuse small, glass jelly jars with screw-on metal lids, about 1/2 a cup in size. You do need to leave a layer of water on top, though, because otherwise the top layer will polymerize and leave a rubbery layer you have to remove the next time you use it.

Gravityloss 1 day ago||
Can't a spatula be just untreated wood? Or some very light oiling just to reduce the absorption of food. And then solve the problem by disposing of them fairly often. They make a lot of heat in the fireplace since they've absorbed so much fat...
chickensong 2 days ago||
Team tung oil here. Wooden-handled knives and wooden utensils get a light coat and left outside on a nice day. Repeat for 3-5 days and you're good for at least a year or two, depending on how you treat the items. The coating needs to be light else you get a shellac/lacquer finish. I use Walrus brand, pure tung oil.
jmkd 2 days ago|
Doesn't make sense to use Osmo Polyx oil as the baseline when Osmo Top oil is the slightly friendlier and equally beautiful food-safe version.
alin23 1 day ago|
Osmo Polyx is what I already had around from other wooden furniture projects, that's all. I try to not store too many cans of unused finishes around my house so I try to use what I already have first.

Top Oil indeed seems very similar to what I did (hardwax, drying oils, driers) but half of it is still white spirit solvent, which I'm guessing will give it the same smell as Polyx.

The closest thing I found to what I want is Walrus Oil Furniture Butter (https://walrusoil.com/products/furniture-butter) but I didn't know about it at the time.

jmkd 20 hours ago||
Walrus product looks good. Here's another one worth knowing but may be difficult to acquire outside UK: https://workshopheaven.com/alfie-shine-hard-wax-polish-fragr...
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