r/ArtisanVideos • u/Areia • Jan 09 '23

Wood Crafts Japanese craftsmen making Go boards [19:59]

https://www.youtube.com/watch?v=RVuDM9jQQ1s
467 Upvotes

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22

u/LincolnshireSausage Jan 09 '23

What does the calcium carbonate do right before applying the oil?

8

u/fooz_the_face Jan 09 '23

Abrasive polish. edit: Westerners would use pumice in various grits.

2

u/LincolnshireSausage Jan 09 '23

That makes sense. He didn't seem to be polishing in the video with it but there was a cut in the video so maybe there is a longer process?

2

u/fooz_the_face Jan 09 '23

Yeah, we call it "rubbing out" - that's why oil is next; it's a lube for the abrasive.

10

u/crocodile_wrestler Jan 09 '23

Although the wood doesn't look very porous, maybe it's for pore filling (analogous to the use of pumice in a french polish)?

3

u/d4rk33 Jan 10 '23

I think grain filler but also just to make the timber lighter. The top stays whiter than the rest.

13

u/spacebarstool Jan 10 '23

I do french polishing. At first the mixture of the medium with a lubricant (calcium Carbonate and oil in this case) acts as about a 1000 grit sandpaper, then as it breaks down through manual rubbing the mixture fills the pores/grain in the wood to seal it.

4

u/LincolnshireSausage Jan 09 '23

Could be wood filler. I searched for calcium carbonate grain filler and found nothing.

2

u/Jayyouung Jan 09 '23

Is it calcium? Looks like a seal or some kind of finish

3

u/LincolnshireSausage Jan 09 '23

The subtitles said calcium carbonate but did not say why they used it. I'm thinking grain filler.