Pro-China demonstrators and human rights campaigners may turn out today in a mix of red and orange, but for some exam students the issues are more black and white. Two rival campaigns have sprung up on the internet appealing for students to attend HKCEE exams today and tomorrow dressed in white or black depending on whether they support or object to the Hong Kong Examinations and Assessment Authority's actions. The campaigns result from a series of controversies that have dogged this year's HKCEE and A-level exams, ranging from the content of exam questions, the language used and allegations of unfair treatment over an exam question which had ambiguous instructions. On a number of internet chat rooms and blogs, posts called on students to wear black as a silent protest against the use of slang in a Chinese-language paper last Saturday. A smaller number have called on students to wear white to demonstrate they support the exams authority. The HKCEE English-language exams - compulsory for gaining entry into Form Six - are being sat by thousands of Form Five students today and tomorrow. A group on the social networking site www.facebook.com calling on students to wear black had more than 1,700 members by last night. Two other groups on the site, also objecting to the use of slang in the Chinese-language HKCEE exam and calling on students to wear black, had close to 1,000 and 700 members each. 'Maybe our protest may not change the HKEAA, but at least we are voicing our opinions in a calm, peaceful way,' one of the Facebook groups posted on their web page. The Chinese-language examination held on Saturday is designed to test students' combined communication skills. It has been criticised for including some slang that has only recently come into fashion, and confused some students over its intended meaning. In a statement issued on Wednesday, the exams authority defended the use of slang, which it said was intended to provide background material for a question on the trend of using 'fashionable language' and 'loanwords' in Hong Kong society. It said the paper clearly advised candidates to take care in selecting what materials to refer to as 'some of the content may not be related to the question'. The statement, released in Chinese, stated that candidates' knowledge of and familiarity with specific slang terms 'is not important and would not influence their answer'.