For 100% polyester fabrics use 1.5 lb. of dye per 100 lbs. of fabric (1.5% OWG) to get medium shades. (With black, you are going to get more of a charcoal grey with this product.) That would be 6 - 4 oz packets, so 3 for 50 lbs. of fabric, etc.
XML data type was introduced in SQL Server 2005. This type allows you to store XML data up to 2 GB. Here is a small example of, pretty much self-explanatory.
As with any other date/time format used by SQL Server, the time or date itself is always optional. If the time portion is not specified, SQL Server will use midnight as the default; if the date portion is not specified, SQL Server will use January 1st 1900 as the date.