This is a great project. If the surface has hardened, then the sugar solution is probably concentrated enough, however, something is inhibiting the crystal formation.
Were you following the experiment described in the science buddies website?http://www.sciencebuddies.org/science-f ... p005.shtml
The procedure includes some important details that are essential for the success of the experiment, including seeding the string with sugar crystals to provide a surface to form the crystals, checking to make sure all of the sugar is dissolved in the saturated solution, leaving the jars undisturbed during the experiment, avoiding large temperature fluctuations, loosely covering the containers to avoid dust and other particles. It’s also possible that you accidentally added oil or another contaminant that would interfere with crystallization during the preparation of the sugar solution.
Now, here is good news for you. I see your project is due this week and there’s not enough time to repeat the experiment before the deadline. I would not recommend setting up the experiment again, however, you should focus on preparing your project board, and final report if it is required. Getting the results that you expected is not essential for a successful science fair project, however, you will need to write up your results and demonstrate that you understand the scientific method and how to do a controlled science project. Here is the information from the Science Buddies website on preparing your project board:http://www.sciencebuddies.org/science-f ... oard.shtml
You should make sure that you write up each section. State your purpose and hypothesis and include a detailed materials and procedure section. In your background section, include the science behind crystal formation. For your results, you will have to report that you did not observe crystal formation. A photograph of your results might be helpful since you don’t have anything to measure. Your conclusion will be very interesting, however, because you can go through the method from the Science Buddies experiment and discuss what might have gone wrong. Your analysis of the problem and statement of what you would do differently next time (if you had time) will help complete the project. Be sure to go back and read the written assignment from your teacher and make sure you include all required information.
You should not expect to win at the science fair, but you can still get an “A” on the assignment by demonstrating how much you know about science. Let me know if you have any questions. Good luck!