Goldfish Development. Baby goldfish are born much darker than they will be as adults. This may be because dark colors helps these small, vulnerable fish escape the attention of predators. With proper husbandry, the fish gradually change color and develop orange or gold scales. Fancy goldfish may develop color patterns including white patches.
Posts: 1,396. Re: Bits for hand drilling hardened steel. If you want to experiment with carbide drilling on the cheap, buy a carbide tipped masonry drill bit set. They are about $20 a set new, but I find them at garage sales for about $1 for the set all the time and that's why I use them.
Carbide Drill Bits. The carbide drill bits provided by Regal Cutting tools are for industrial use in materials such as cast iron, nonferrous heavy metal and other abrasive materials. Carbide drill bits maintain a sharp cutting edge longer than HSS or Cobalt and are run at higher speed rates as they absorb heat more efficiently.