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By Anne Marie Helmenstine, Ph.D., About.com Guide to Chemistry since 2001

Slime FAQs

Monday November 10, 2008
Green Slime (Anne Helmenstine)
I've gotten a lot of questions about making slime, so I figured it would be a good idea to address them in one place. Here are some of the most common slime questions and answers:
  • How do I make translucent slime? How do I make opaque slime?
    Basically, your slime will be about as transparent as the glue you use to make it. If you use white school glue, then your slime will be opaque. If you use translucent clear or blue glue gel (or another see-through color), then your slime will be translucent.

  • Can I mix the slime solutions in advance?
    Yes, you can prepare the borax solution and glue solution days or weeks before actually making the slime.

  • Are borax and boric acid interchangeable? Can I substitute one for the other?
    Borax and boric acid are not the same chemical; borax [Na2B4O7·10H2O or Na2[B4O5(OH)4]·8H2] is a salt of boric acid [B(OH)3]. I haven't tried making slime using boric acid. (Feel free to post a comment if you can offer a more complete answer to this question.)

  • How do I color slime?
    If your glue is tinted, then your slime will be colored. You can mix food coloring in with either slime-making solution. You can also add glitter or other decorations.

  • How long can I keep my slime?
    Slime doesn't go 'bad', but you may want to toss it if it develops mold or if it dries out. Refrigerated slime, kept in a baggie, should last for a couple of weeks. My daughter has a bag of slime (not refrigerated) that she made a few months ago, so it can last much longer.
Do you have any unanswered slime questions? If so, post them here and I'll update this list.

Comments

November 11, 2008 at 1:46 pm
(1) caity bryant says:

I am working on the soap project that you did.
I just have one question, What is closed cell foam formation?? ive looked for it everywhere on the internet and i cant find any infomation on closed cell foam formation.

February 25, 2009 at 4:35 pm
(2) Anika says:

What is the chemical name for a slime
made out of polyvinyl alcohol and borax?

Can someone please help me?

March 12, 2009 at 1:49 pm
(3) Anne says:

Boric acid solution doesn’t work as a substitute for borax.

April 17, 2009 at 10:35 pm
(4) marco says:

Hi!
I would like to know the definition of green slime please.

Thanks :)

June 7, 2009 at 8:04 pm
(5) Neeta says:

What can I substitute for Borax when making slime? I triedmaking slime with cornstarch and water but the consistency is not like the shop-bought slime.

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