updated the color used for neon to be something a little brighter, see https://github.com/phetsims/states-of-matter/issues/49
updated the color used for neon to be something a little brighter, see https://github.com/phetsims/states-of-matter/issues/49

phetsims/nitroglycerin,phetsims/nitroglycerin,phetsims/nitroglycerin