Identify Spruce and Cedar

Construction and repair of Classical Guitar and related instruments
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keithwwk
Posts: 139
Joined: Mon Dec 29, 2014 5:12 am
Location: Singapore

Identify Spruce and Cedar

Post by keithwwk » Fri Sep 29, 2017 2:00 am

Dear Luthiers,

I have tried light bulb test into Spruce amd Cedar guitar I owned and Spruce do let the light passed through and Cedar didn't.

My question is, is this test sure work on all Spruce vs Cedar? Any possibility light don't pass through certain type of Spruce on a classical guitar?

I am asking this question is because some old guitar's top, due to aging finishing look very cedar but in fact a spruce top.
Antonio Picado Model 60 Spruce 2017
M.Sakurai No.5 Cedar 1976
Yamaha G225

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Steve Toscano
Luthier
Posts: 115
Joined: Mon May 30, 2016 12:01 pm
Location: Newcastle, Australia

Re: Identify Spruce and Cedar

Post by Steve Toscano » Fri Sep 29, 2017 4:48 am

Im yet to find a spruce top that doesnt let light through at the thickness i take them down too (2.2 - 2.5, depending on the top).

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Steve Toscano
Luthier
Posts: 115
Joined: Mon May 30, 2016 12:01 pm
Location: Newcastle, Australia

Re: Identify Spruce and Cedar

Post by Steve Toscano » Fri Sep 29, 2017 4:49 am

Im yet to find a spruce top that doesnt let light through at the thickness i take them down too (2.2 - 2.5, depending on the top).

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Doug Ingram
Amateur luthier
Posts: 1561
Joined: Fri Jan 25, 2008 11:11 pm
Location: Lorette, Manitoba, Canada

Re: Identify Spruce and Cedar

Post by Doug Ingram » Sat Sep 30, 2017 6:40 pm

If you lightly sand on the interior, just enough to make a little bit of dust, you can easily smell the difference. However you will need a sample to familiarize yourself with their particular scent.

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