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.
Report Abuse. Use a 'high speed steel' bit. A masonry bit is not appropriate for metal. Those gold colored 'titanium coated` bits will probably go through any but hardened steel with little problem. When you hit the metal, use a small bit to make a pilot hole, and then proceed with your full sized bit.