Here’s an easier way to make filled test tubes or other colored glass/ plastic. I’m currently working on a kit called Mira’s Magic House. The instructions wanted me to roll up super tiny pieces of colored paper and insert them into equally super tiny pieces of plastic tubing. This was not working for me so I decided to color half of each of the tubes with permanent markers. This works much easier and I think it even looks better.
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How original!! This is such a great trick that could make our lives easier. Sometimes there’s no need to overcomplicate things — you can create beautiful results without all the fuss. Thank you, @Selena_Ferguson!
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Wow, this looks amazing! 
I actually think it looks better than with paper inside. Thanks for sharing the tip, because it really does make it much easier.
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I made this one. I didnt have trouble getting the paper in but this kit was very poor quality. I snapt several parts and the bird cage and couldren where a nightmare so i skipped those. Not the quality like rolife to be fair
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Thank you for sharing these valuable tips! 
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Awesome tip, I definitely learned! Thanks for sharing—would love to see more of these handy little tricks from you 
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What a great idea!
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wow, good tips
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Fantastic tip! Using markers to color the tubes is genius—and way less fiddly. Thanks for sharing!
That’s such a clever hack! Thanks for sharing,definitely filing this away for future projects.
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Your version with tubes looks more realistic! Thank you for sharing your trick
That is such a clever solution, and I really learned something new from your approach. Using permanent markers not only saves time but also gives the tubes a clean and vibrant effect.
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Thanks! Very useful advice.
That’s such a clever idea! 
Please keep sharing more of these little tricks, they’re super helpful and inspiring! 
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Picked up a few handy tips!
It’s like there’s real reagent in this test tube!