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 tipped drill bits are strong bits with high heat resistance used for high speed drilling by auto mechanics, locksmiths and machinists drilling into hardened steel. The bits are used to drill out broken bolts and drill bits and to drill into safes and through studs. They are best suited for industrial uses.