The Influencing factors of the density values of photogrophic film of X-ray to beryllium
铍材X射线照相中影响底片黑度值的因素
black-and-white negative stock
黑白底片,黑白负片
Black-and-white dupe negative film
黑白翻底片(摄影)
black second coating antifouling
黑色第二度船底防污漆
black lead first coating anticorrosive
黑铅第一度船底防锈漆
Typical density ranges are 0--1.6 for printing; 0--1.8 for black-and-white and colour papers,0--1.2 for black-and-white and colour negative ,and 0--3.0 for colour transparencies.
典型的密度范围是：印刷品从0至1.6；黑白及彩色底片从0至1.2；彩色幻灯片从0至3。
Black & White film is good for portraits.
黑白底片照肖像效果很好。
A chemical bath used to change the color of a photographic print or to preserve black-and-white prints or movie film.
调色液一种用来改变照片底片颜色或保留黑白底片及影片的化学药液
You have to black out all the windows to develop films.
要使底片显影你得用黑布遮住窗户以免透光。
An early type of photograph made by imaging a negative on glass backed by a dark surface.
玻璃干版照相把底片放在有黑色背面的玻璃板上成像的早期照片
To expose(a photographic film or plate) too long or with too much light.
使（底片等）曝光过度使（摄影用的胶卷或底片）暴露过久或过分曝光
(of a scale of film speeds)American Standards Association(/British Standard)
（指底片度数）美国标准（[英国标准]）
Usefulness includes the fact the negatives have been calibrated.
所谓有用，是指在底片上要有标度。
It tends to increase the contrast of the reduced negative.A strong solution can be used to dissolve and remove the black silver of negatives from unwanted areas.
经过减薄的底片，形成较大反差。浓的溶液可用来把底片上局部不要的黑银粒溶解而除去。
Determination of speed of black-and-white motion-picture negative film
GB/T15958-1995黑白电影负片感光度的测定
Desity range: The difference between the minimum and maximum demsity of a printing , a print or filml.
密度范围:印刷品，相片或底片上最高密度和最低密度的差距。
BT-X silica white is filled into transparent or semi-transparent shoe-bottom.
X白炭黑填充于透明及半透明鞋底，提高鞋底的强度、磨性能。
You can rein in highlights by" pulling," or shortening, the development of b& w film.
在黑白底片的冲洗上，你可以透过减感来控制明暗的表现。