Those rolls of hay are called round bales.. The price varies depending on the kind of hay (grass or legume), its quality and on the supply/demand in the region where it's being sold.
Semi-permanent hair color has smaller molecules than temporary dyes. These dyes only partially penetrate the hair shaft. For this reason, the color will survive repeated washing, typically 4â5 shampoos or a few weeks.
Meanwhile, the complete permanent hair color process can lighten hair and embeds color more deeply into hair. This is why it provides full coverage for grays and complete hair color changes, and lasts much longer than semi permanent hair color.