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.
No center point is needed, as these 135&#176; quick cut points are self&#45;centering and penetrate faster with less pressure. Will not walk or wander at the starting surface. Extremely heat&#45;resistant, these drill bits are most efficient in drills that operate at 1500 RPM or more. Cobalt high speed steel drill bits offer a 12X life rating, compared to standard 118&#176; point drill bits..