Message:

<p>[QUOTE=&quot;Michael H Webb, post: 3751634, member: 93313&quot;]Acetone always leaves an ugly residue, regardless of purity.</p><p><br /></p><p>This is an example of a coin I submitted not noticing it had residue left by&nbsp; acetone:</p><p><br /></p><p><img src="https://i.imgur.com/Z4Yi1Jj.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /> </p><p><br /></p><p>Such acetone residue can not be conventionally removed from a coin surface by distilled water or by isopropanol because these solvents bead, while acetone covers the coin surface completely.</p><p><br /></p><p>For example, an acetone dip may be used in conjunction with other solvents to provide a <i>substrate</i> free from residue.</p><p><br /></p><p>One would need a ventilator hood, a probe sonication device, a temperature controlled nitrogen evaporator, supply of glass beakers, metal clips to fasten the substrate, etc</p><p><br /></p><p>Don&#039;t know if a coin could be mounted in such a way as to survive the probe sonication which provides up to 1,000 times the power of tub style ultrasound.</p><p><br /></p><p>See technician&#039;s question concerning wafers below:</p><p><a href="https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues" rel="nofollow">https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues</a></p><p><br /></p><p>Such a procedure to provide wafers free from residue is outlined in the response below:</p><p><a href="https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues/e0i78gi/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues/e0i78gi/" rel="nofollow">https://www.reddit.com/r/chemistry/comments/8qca7z/why_does_acetone_leave_residues/e0i78gi/</a></p><p><br /></p><p>Best regards[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in