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.
Heat can and will damage drill bits. Professionals use oil when drilling steel. The oil lubricates the metal and drill bit as it spins. The oil also acts as a heat sink absorbing much of the heat. Simply squirt oil on the metal before you start to drill and add more oil as you drill.eat can and will damage drill bits. Professionals use oil when drilling steel. The oil lubricates the metal and drill bit as it spins. The oil also acts as a heat sink absorbing much of the heat. Simply squirt oil on the metal before you start to drill and add more oil as you drill.