负片的整修在黑白人像摄影中是时常碰到的问题整修时要将HB的铅笔削成5至7厘米长的尖刺状︵铅长些其弹性相对大些︶轻轻修划在欲改变影调的位置上一般情况下底片在整修前要用一种特制的修相油擦在底片的药膜面上否则铅笔打滑不易修上修相油用量很少价钱也便宜 Negative film renovation in black and white portrait photography is often encountered problems  renovation of the HB pencil should be cut into 5 to 7 cm long spines (lead longer, its flexibility is relatively large)  gently planted in the desire Change the tone of the position  Under normal circumstances  negative film before the renovation to use a special repair phase rub oil film surface in the film  or pencil skid  not easy to repair  repair phase oil consumption is very small  price Cheaper