Jeffrey starting mixing the various Oobleck and slime mixtures. Taking the various supplies they had bought he slowly started to make the recipes in his [Science Project] folder.
He focused on two types, Glow-in-the Dark Oobleck and Scented slime.
Mixing the glue, corn starch, green food dye, and glow powder. He made about 5 cups worth of Glow in the Dark Oobleck in a glass kitchen bowl.
Then focusing on another recipe, Jeffrey used scented dish soap to make the scented slime.
Finally he prepared a few cups of varying amounts of corn starch Oobleck so that the thickness and viscosity of the differing mixtures were distinguishable.
Finishing the mad scientist and business part of his science fair project. He started to gather data.
He prepared a lined background to measure the distance the liquid would drop. Then using a camera he started to record how far each of the different mixtures traveled. Taking various physics equations and the frames of each recording he plotted out the data and made a chart on Excel.
Making a Hypothesis, checking the null hypothesis, areas of error, collecting data, and making a conclusion. Jeffrey made sure his project followed the Scientific Method.
He planned out what decorations he needed to make his project "Marketable" and then decided to get some work done by the class artist Eric Shub.
Jeffrey spent a few hours writing the various titles, preparing charts, his presentation and then moved on to his main goal.
Coming up with a name and logo, he decided to call his school enterprise "The Slime Factory", with a simple gear logo he intended to photocopy with fancy text and labels. He would then print out the sheets with the text, crafting the completed template and placed the master copy in his folder.
He cut out the labels to put on the mason jars, color coded some of them with special names, and completed a batch of 12 jars of Oobleck, 6 of each kind.
"Phew", Jeffrey took a breath. The greater part of his weekend was dedicated to making his product and now it was time to figure out how to sell it.
He placed 4 of each in a cardboard office box and kept the rest to put in his backpack to take to school.
He had a choice to make, gift some to the teachers and let them know who spread the "Toy".
Otherwise he'd do it privately and unregulated, trying to start a black market by creating demand and advertising. It was easier to ask for forgiveness than to ask for permission, especially since it was being done on school grounds.
Jeffrey knew that if it ever became popular the school rules would change to ban the substance in school or prevent students from bringing it to class. Jeffrey consciously made the decision to use mason jars rather than plastic bags, because it looked more high end and looked less like drugs.
Jeffrey knew he was going to need to use a lockbox rather than a pencil box. However money always complicated issues. Thankfully backpack search laws required probable cause and in a public school he could hide it safely if he kept it under wraps.
The white cardboard office box would probably help as well.
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Planning & Considerations
Jeffrey was going to make some friends and the best way to do that was to talk to the school principle, his science teacher, a school counselor, perhaps even his parents and finally various close friends.
Especially if he won the science fair, his prestige and advertising would reach an all-time high. However he'd play it by ear and deal with any issues that popped up when it happened.