The 10g sample of strontium chloride was delivered promptly. It was well-sealed, and clearly labelled with safety and storage information. The strontium chloride powder produced a bright red flame when used by my students in a flame-spectrum lab. 10g is just the right quantity for a typical classroom to use for several sessions. Thanks for stocking small quantities and delivering them quickly! The HomeScienceTools website saves a lot of time and paperwork -- it helped me to get refills for my classroom at a moment's notice.