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<p>[QUOTE=&quot;-jeffB, post: 2386850, member: 27832&quot;]Oh, that might be a bad idea.</p><p><br /></p><p>First of all, as I understand it (and I&#039;m not in the industry), different gases have different fittings to prevent costly (&quot;explosive&quot;) accidents. So, you&#039;d probably need to build some sort of adapter yourself -- most suppliers probably wouldn&#039;t want to help you out.</p><p><br /></p><p>Second, hydrogen tends to get overly familiar with a lot of metals, especially when it&#039;s under pressure. A regulator constructed for nitrogen might weaken and fail catastrophically if used with hydrogen. (Again, no certainty here; if they&#039;re all-brass construction, it might be fine. Steel, at least some types, is bad. Aluminum is right out.)</p><p><br /></p><p>Stick with methanol. If the coin&#039;s dark anyhow, consider using a big Fresnel lens to concentrate sunlight onto it within the sealed vessel. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie2" alt=";)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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