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# Question: Split DVD – which part to use for spectrometer

Nelari is asking a question about spectrometry:

by Nelari |

I split the DVD that came with the spectrometer kit. There are now four parts:

1. the top side, dull

2. the top side, glowing with rainbow colors (the opposite side has text)

3. the bottom side, clear with a purple tint

4. the bottom side, glowing with rainbow colors

Which part should I cut for the spectrometer?

Thank you for any tips!

### 4 Comments

Thank you; I now have a meter that seems to work OK. I gave up on the paper version, though – it was just too wobbly. I used wood, instead, to get some rigidity.

But after getting a few photos that look good enough, I'm stuck with calibration. There is a video here about Spectral Workbench, but I find it impossible to follow. There is a lot of Uh's and Ah's, say. I mean, there does not seem to be a script.

Note that I'm a total newbie as regards spectrometry. Is there a written how-to anywhere?

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Can you cut the bottom side, glowing with rainbow colors? Thank you

On Sat, May 25, 2019 at 6:26 PM \<notifications@publiclab.org> wrote:

Public Lab contributor Nelari just posted a new research note entitled ' Split DVD – which part to use for spectrometer':

Read and respond to the post here: https://publiclab.org/notes/Nelari/05-25-2019/split-dvd-which-part-to-use-for-spectrometer

I split the DVD that came with the spectrometer kit. There are now four parts:

1. the top side, dull

2. the top side, glowing with rainbow colors (the opposite side has text)

3. the bottom side, clear with a purple tint

4. the bottom side, glowing with rainbow colors

Which part should I cut for the spectrometer?

Thank you for any tips!

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I did just that, four months ago, so that problem has already been solved – but thanks all the same. However, I could not make sense of Spectral Workbench, and gave up on the spectrometer.

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