Do a test exposure, cover the negative, on a piece of scrap board, and expose a strip for 10 seconds say, move card along to reveal an extra strip, expose and so on. Develope and chose time that give best result. In the example the first strip would be exposed for 20 secs and the second strip ten. Depending on the lamp, wavelength sensity of film and height, the time requie3d can vary considerably.
Write the times on the card as it is easy to forget how many you have done.
Malcolm
I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir
--------------------------------------------
On Fri, 8/19/16, kbyrne10@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
Subject: [Homebrew_PCBs] First Negative developement Brd
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, August 19, 2016, 1:36 PM
I finally have all the supplies that I
need and need a question
answered.SuppliesScotch
LaminatorOffice depot Black and white
copier transparencies. Two copies of each experiment
circuit.Dry film bought in
ChinaPH up bought on
E-BayEagle to Gimp
negativeDakta light bulb approx 12 in
above frame.Question? How long do I turn
on light bulb for first experiment in developeing
board.If it fails to develope properly
how much time do I add for next
experiment?What is correct procedure for
this experiment to learn this aspect properly?
#yiv3949153176 #yiv3949153176 --
#yiv3949153176ygrp-mkp {
border:1px solid #d8d8d8;font-family:Arial;margin:10px
0;padding:0 10px;}
#yiv3949153176 #yiv3949153176ygrp-mkp hr {
border:1px solid #d8d8d8;}
#yiv3949153176 #yiv3949153176ygrp-mkp #yiv3949153176hd {
color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px
0;}
#yiv3949153176 #yiv3949153176ygrp-mkp #yiv3949153176ads {
margin-bottom:10px;}
#yiv3949153176 #yiv3949153176ygrp-mkp .yiv3949153176ad {
padding:0 0;}
#yiv3949153176 #yiv3949153176ygrp-mkp .yiv3949153176ad p {
margin:0;}
#yiv3949153176 #yiv3949153176ygrp-mkp .yiv3949153176ad a {
color:#0000ff;text-decoration:none;}
#yiv3949153176 #yiv3949153176ygrp-sponsor
#yiv3949153176ygrp-lc {
font-family:Arial;}
#yiv3949153176 #yiv3949153176ygrp-sponsor
#yiv3949153176ygrp-lc #yiv3949153176hd {
margin:10px
0px;font-weight:700;font-size:78%;line-height:122%;}
#yiv3949153176 #yiv3949153176ygrp-sponsor
#yiv3949153176ygrp-lc .yiv3949153176ad {
margin-bottom:10px;padding:0 0;}
#yiv3949153176 #yiv3949153176actions {
font-family:Verdana;font-size:11px;padding:10px 0;}
#yiv3949153176 #yiv3949153176activity {
background-color:#e0ecee;float:left;font-family:Verdana;font-size:10px;padding:10px;}
#yiv3949153176 #yiv3949153176activity span {
font-weight:700;}
#yiv3949153176 #yiv3949153176activity span:first-child {
text-transform:uppercase;}
#yiv3949153176 #yiv3949153176activity span a {
color:#5085b6;text-decoration:none;}
#yiv3949153176 #yiv3949153176activity span span {
color:#ff7900;}
#yiv3949153176 #yiv3949153176activity span
.yiv3949153176underline {
text-decoration:underline;}
#yiv3949153176 .yiv3949153176attach {
clear:both;display:table;font-family:Arial;font-size:12px;padding:10px
0;width:400px;}
#yiv3949153176 .yiv3949153176attach div a {
text-decoration:none;}
#yiv3949153176 .yiv3949153176attach img {
border:none;padding-right:5px;}
#yiv3949153176 .yiv3949153176attach label {
display:block;margin-bottom:5px;}
#yiv3949153176 .yiv3949153176attach label a {
text-decoration:none;}
#yiv3949153176 blockquote {
margin:0 0 0 4px;}
#yiv3949153176 .yiv3949153176bold {
font-family:Arial;font-size:13px;font-weight:700;}
#yiv3949153176 .yiv3949153176bold a {
text-decoration:none;}
#yiv3949153176 dd.yiv3949153176last p a {
font-family:Verdana;font-weight:700;}
#yiv3949153176 dd.yiv3949153176last p span {
margin-right:10px;font-family:Verdana;font-weight:700;}
#yiv3949153176 dd.yiv3949153176last p
span.yiv3949153176yshortcuts {
margin-right:0;}
#yiv3949153176 div.yiv3949153176attach-table div div a {
text-decoration:none;}
#yiv3949153176 div.yiv3949153176attach-table {
width:400px;}
#yiv3949153176 div.yiv3949153176file-title a, #yiv3949153176
div.yiv3949153176file-title a:active, #yiv3949153176
div.yiv3949153176file-title a:hover, #yiv3949153176
div.yiv3949153176file-title a:visited {
text-decoration:none;}
#yiv3949153176 div.yiv3949153176photo-title a,
#yiv3949153176 div.yiv3949153176photo-title a:active,
#yiv3949153176 div.yiv3949153176photo-title a:hover,
#yiv3949153176 div.yiv3949153176photo-title a:visited {
text-decoration:none;}
#yiv3949153176 div#yiv3949153176ygrp-mlmsg
#yiv3949153176ygrp-msg p a span.yiv3949153176yshortcuts {
font-family:Verdana;font-size:10px;font-weight:normal;}
#yiv3949153176 .yiv3949153176green {
color:#628c2a;}
#yiv3949153176 .yiv3949153176MsoNormal {
margin:0 0 0 0;}
#yiv3949153176 o {
font-size:0;}
#yiv3949153176 #yiv3949153176photos div {
float:left;width:72px;}
#yiv3949153176 #yiv3949153176photos div div {
border:1px solid
#666666;min-height:62px;overflow:hidden;width:62px;}
#yiv3949153176 #yiv3949153176photos div label {
color:#666666;font-size:10px;overflow:hidden;text-align:center;white-space:nowrap;width:64px;}
#yiv3949153176 #yiv3949153176reco-category {
font-size:77%;}
#yiv3949153176 #yiv3949153176reco-desc {
font-size:77%;}
#yiv3949153176 .yiv3949153176replbq {
margin:4px;}
#yiv3949153176 #yiv3949153176ygrp-actbar div a:first-child {
margin-right:2px;padding-right:5px;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg {
font-size:13px;font-family:Arial, helvetica, clean,
sans-serif;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg table {
font-size:inherit;font:100%;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg select,
#yiv3949153176 input, #yiv3949153176 textarea {
font:99% Arial, Helvetica, clean, sans-serif;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg pre, #yiv3949153176
code {
font:115% monospace;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg ∗ {
line-height:1.22em;}
#yiv3949153176 #yiv3949153176ygrp-mlmsg #yiv3949153176logo {
padding-bottom:10px;}
#yiv3949153176 #yiv3949153176ygrp-msg p a {
font-family:Verdana;}
#yiv3949153176 #yiv3949153176ygrp-msg
p#yiv3949153176attach-count span {
color:#1E66AE;font-weight:700;}
#yiv3949153176 #yiv3949153176ygrp-reco
#yiv3949153176reco-head {
color:#ff7900;font-weight:700;}
#yiv3949153176 #yiv3949153176ygrp-reco {
margin-bottom:20px;padding:0px;}
#yiv3949153176 #yiv3949153176ygrp-sponsor #yiv3949153176ov
li a {
font-size:130%;text-decoration:none;}
#yiv3949153176 #yiv3949153176ygrp-sponsor #yiv3949153176ov
li {
font-size:77%;list-style-type:square;padding:6px 0;}
#yiv3949153176 #yiv3949153176ygrp-sponsor #yiv3949153176ov
ul {
margin:0;padding:0 0 0 8px;}
#yiv3949153176 #yiv3949153176ygrp-text {
font-family:Georgia;}
#yiv3949153176 #yiv3949153176ygrp-text p {
margin:0 0 1em 0;}
#yiv3949153176 #yiv3949153176ygrp-text tt {
font-size:120%;}
#yiv3949153176 #yiv3949153176ygrp-vital ul li:last-child {
border-right:none !important;
}
#yiv3949153176