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.
A bench grinder is easily one of the best ways to sharpen drill bits that are very worn, or even broken. If you drill through lots of hardwood or metal, or if you often hit masonry or nails with your twist drill bits, a grinder will put an edge back on them, fast. Most bench grinders come with two sharpening wheels, one coarse and one fine. You can do the bulk of the sharpening quickly using the coarse wheel. Then, move over to the fine wheel to put the finishing touches to the drill point. As you sharpen drill bits, a bench grinder makes it easy for you to dip the points briefly in water.