One of my fondest childhood memories was of visiting the Tid-Bit in Martins Ferry, Ohio and buying out their old collection of chemistry set chemicals for 60 cents each. I bought the fun stuff like sulfur, copper, iron filings, and potassium nitrate (charcoal I could make at home) and some off the odd stuff like Cobalt Chloride that I just loved to look at for the color. I learned very little from… → Read More