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.
If you want a full set of bigger hole cutting drill bit, then these bits from Diamond City, do get good reviews and you get a lot for your money. There are ten different sizes in this drill bit kit, and they can be used on porcelain, marble, granite, ceramic, glass and they will even go through most types of rock. These are very good and I keep these as what I call my stock set. In other words the bit that I use every day for those difficult drilling jobs.