Taiwan's share prices dipped Tuesday, with the weighted index, the market's key barometer, falling 11.51 points, or 0.14 percent, to close at 7,807.62. The local bourse opened at 7,838.53 and fluctuated between 7,846.78 and 7,792.56 during the day's trading session. A total of 4.63 billion shares changed hands on market turnover of NT$130.86 billion (US$4.05 billion). Three of eight major stock categories gained ground, with foodstuff issues moving up the most at 0.5 percent, followed by banking and financial issues at 0.3 percent and plastics and chemicals stocks at 0.1 percent. The other five stock categories lost ground, with cement giving up the most at 1.4 percent, followed by paper and pulp at 1.2 percent, textile at 0.5 percent, cement stocks, and machinery and electronics issues both at 0.2 percent. Losers outnumbered gainers 1,512 to 1,035, with 308 stocks remaining unchanged. Foreign institutional investors were net buyers of NT$2.59 billion worth of shares. 