Voters are being reminded not to put their vote at risk during tomorrow’s historic poll.
The message to the public is to just put one cross against their choice.
Anyone writing any slogans on their ballot paper puts their vote at risk of being discounted.
And taking a selfie as you cast your vote is strictly forbidden.
All photography is banned in polling stations, so while those who cast a postal vote may have chosen to record their vote for posterity, those doing so in person will not be allowed.
A spokeswoman for the Chief Counting Officer Mary Pitcaithly said: “There are strict rules at polling places.
“You can’t do a selfie when you cast your vote. There is no photography in order to project the secrecy of the ballot.
“The rules are the same at every election.”
Counting officers in Scotland’s 32 local authorities have been issued with a 56-page booklet of guidance on how to verify questionable ballots.
This covers how to adjudicate if someone has made a mark at both options, if someone has written a slogan or across the paper.
The spokeswoman said that the message to voters was to mark just one cross at their chosen option.
She said: “If you do anything else, you risk your vote being counted.”
Supporters of both sides are expected to fiercely contest any doubtful votes.
But if there are large numbers of contested papers, this will delay the result.
And there will be no national recount if the vote proves to be close.