What a tactile varnish job needs from inspection
A tactile varnish is inspected for varnish where it should be, and no varnish where it should not be. It is not measured as a colour difference of the hand feel.
A tactile varnish is inspected for varnish where it should be, and no varnish where it should not be. It is not measured as a colour difference of the hand feel. The camera sees coverage and spatter. Thickness and hand feel use a separate sample sheet. Do not write that an instrument has already measured the thickness.
Why it is judged this way
A local thick varnish shows an edge under angled light. That edge is normal. Varnish that flies onto the text covers the type, and that stops. Without angled light, a large missing patch may also be invisible, so the light has to show the difference between varnish and no varnish.
What to compare
| What you see | What to call it | What not to do |
|---|---|---|
| Varnish covers text or a barcode | Stop | Call it a designed highlight |
| A region that should have varnish has none | Stop | Release it because the colour difference passed |
| The edge is slightly high and matches the signed sample | Do not alarm | Tighten the whole region |
At job change or when a roll is opened
- Use light that can tell varnish from no varnish.
- Mark the regions where varnish is allowed.
- Use a sample that has flown onto the text and confirm the alarm.
